1. AP Chemistry

    A 0.2500 M NaOH solution was used to titrate a 16.85 mL hydrofluoric acid solution. The endpoint was reached after 31.20mL of titrant were added. Find the molar concentration of hydrofluoric acid in the original solution.

    asked by Rebecca on February 4, 2018
  2. Chemistry

    In the industrial synthesis of ammonia, the equilibrium constant expression may be written as: Keq= [NH3]^2/[N2][H2]^3 Calculate the value of this equilibrium constant, if the equilibrium concentration of nitrogen in the reaction mixture at 600Β°C if [N2]

    asked by Chemistry Chick on November 18, 2011
  3. Grade 11 Chemistry

    Calculate the concentration of I- in an aqueous solution prepared in a 250 ml volumetric flask from 50.0 ml of a 0.840 mol/L aluminum iodide solution and 160.0 ml of a 0.500 mol/L tin(IV) iodide solution.

    asked by Sim on March 28, 2015
  4. CHM 114

    Calculate the [MnO4-] concentration of the diluted sample when the sample is prepared in the following manner. Add 2 drops oxalic acid, 4 drops permanganate and 8 drops water. The original permanganate is 0.25M. Help!

    asked by Hannah on January 29, 2018
  5. Chemistry

    Consider the reaction CaSO4(s)rightleftharpoons Ca^2+(aq)+ SO_4^2-(aq) At 25 C the equilibrium constant is Kc = 2.4 \times 10^-5 for this reaction. If excess CaSO4(s) is mixed with water at 25C to produce a saturated solution of CaSO4, what are the

    asked by Josh G. on November 6, 2012
  6. equilibrium concentration

    A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be ? M. Wouldn't that be 0.002 x 1/11 = ??

    asked by Christine on April 4, 2007
  7. Chemistry

    A 51.46 mL sample of an ammonia solution is analyzed by titration with HCl. The reaction is given below. NH3(aq) + H+(aq) NH4+(aq) It took 38.57 mL of 0.0984 M HCl to titrate (react completely with) the ammonia. What is the concentration of the original

    asked by Anonymous on October 28, 2010
  8. Chemistry

    The equilibrium constant (Keq) is the ratio of ____ concentrations to ____ concentrations at equilibrium, with each concentration raised to a power equal to the number of ____ of that substance in the balanced chemical equation.

    asked by MEGAN!!!!!!!!!!! on May 7, 2010
  9. Chem

    Using the Absorbance (0.455) of your Unknown SCN- solution and the slope (3163.9) from your Calibration Curve, calculate the concentration of SCN- in the solution created from 5.0 mL 0.200 M Fe(NO3)3, 40.0 mL H2O and 5.0 mL SCN-. How would I calculate?

    asked by Mark on March 1, 2015
  10. Chemistry

    For the following reaction, the equilibrium constant Kc = 97.0 at 900K. If the initial concentrations of NH3 and H2S are both 0.20 M, what is the equilibrium concentration of H2S? H2S(g) + NH3(g) = NH4HS(s) Would you have to create an ICE chart for this

    asked by David on March 17, 2012
  11. Chemistry

    A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be__?__M

    asked by UN on June 28, 2008
  12. Chemistry

    Why doesn't a reaction occur when thiosulfate ions are added to solid silver iodide, but does occur when added to silver bromide?What role does the equilibrium concentration of silver play in this phenomenon?

    asked by Chamy on May 22, 2012
  13. Chemistry

    Calculate the concentration, in molarity, of a solution prepared by adding 9 mL of water to 1 mL of 0.1 M HCl solution. If 2.0 mL of 0.010 M NaOH is mixed with enough water to make the total volume 8 mL, what is the molarity of the resulting solution?

    asked by Nico on October 3, 2011
  14. Physics

    Consider the 676 N weight held by two cables shown below. The left-hand cable had tension 740 N and makes an angle of ΞΈ with the wall. The right-hand cable had tension 730 N and makes an angle of ΞΈ1 with the ceiling. a) What is the angle ΞΈ1 which the

    asked by Hannah on January 8, 2011
  15. science

    The solubility products of AgCl and 𝐴𝑔3𝑃𝑂4 are 1.6 Γ— 10βˆ’10 and 1.8 Γ— 10βˆ’18, respectively. If 𝐴𝑔+ is added (without changing the volume) to 1.00 L of a solution containing 0.10 mol πΆπ‘™βˆ’ and 0.10 mol 𝑃𝑂4 3βˆ’, calculate

    asked by samantha sipioni on October 17, 2019
  16. Chemistry

    A 0.512g sample of CaCO3 is dissolved in 12M HCl and the mixture is diluted to 250ml. A. Calculate the concentration of Ca+2 in the 250ml solution? B. How many moles of Ca+2 are in a 25ml sample of th 250ml solution?

    asked by Felix Dagogo on April 26, 2019
  17. Chemistry

    HCI is a strong acid. What is the ion concentration, (H+), of a 0.0015M solution of HCI? What is the pH of a 0.0015M solution of HCI? I have looked in my book but it not making sense. I am not sure where to even start the problem. A little guidance please

    asked by Yvonne on March 16, 2015
  18. Chemistry

    When CO2(g) (0.118 mol/L) and H2(g) (3.90 mol) in a 33.0 L reaction vessel at 980K are allowed to come to equilibrium the mixture contains 0.0853 mol/L of H20(g). What concentration (mol/L) of CO2(g) reacted? CO2(g) + H2(g) CO(g) + H2O(g)

    asked by Riley on April 10, 2008
  19. AP Chemistry

    A 0.3500 MHCl solution was used to titrate a 21.60 mL sodium acetate solution. The endpoint was reached after 25.75 mL of titrant were added. Find the molar concentration of sodium acetate in the original solution.

    asked by Rebecca on February 4, 2018
  20. Chemistry

    2NaF + CaCl2 ¨ CaF2 + 2NaCl An excess of 0.20 M NaF is used to precipitate the calcium ions from a 50.0 mL sample of a calcium chloride solution. What is the concentration of the original calcium chloride solution?

    asked by Neha on July 10, 2011
  21. science

    how do you do this question An aqueous solution of calcium chloride contains 2 grams of calcium chloride ( molar mass 110.98 g mol-1) in 100 ml calculate the concentration of chloride ion (Cl-) in the solution

    asked by Slaysliver on January 22, 2009
  22. chemistry

    A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be ____ M.

    asked by Gloria on April 10, 2008
  23. AP CHEM

    is there some rule on weak and strong electrolytes and the amount of concentration requiered for each? for example are weak electrolytes supposed to have low concentrations and vice versa for strong electrolytes? if so cna you please explain why as well?

    asked by Sally on April 2, 2014
  24. analytical chemistry

    An EDTA solution is standardized against a solution of primary standard CaCO3 (0.5622 g dissolve in 1000 ml of solution) and titrating aliquots of it with the EDTA. If a 25.00 ml aliquot required 21.88 ml of the EDTA, what is the concentration of the EDTA?

    asked by Anonymous on February 3, 2013
  25. science

    How many times did Earth orbit the sun between 140 CE and 1543 , how do you figure this up???? If you know how many years that is, the earth orbits the sun once a year. I hope this helps. Thanks for asking. How many years is 140 Ce to 1543 ?? We need to

    asked by Charlotte on September 5, 2006
  26. english

    Hello! I am a senior student who lives in Paris, therefore English is my seocnd language. I need help to my examen oral. Tomorrow, I have to talk about: "Occupy Wall Street" movement (what's happening? analyzing the situation, is the movement important?

    asked by V on November 20, 2011
  27. Chem

    If 15.0 cm3 of 2M hydrochloric acid reacted exactly with 40.0 cm3 of potassium hydroxide. Calculate the concentration of the alkali I got the answer of .75M for KOH I went from cm^3 of HCl to L to mols then mols of KOH then to molarity of KOH. Is this

    asked by Maddy on September 8, 2017
  28. Chemistry

    Consider the reaction A+B->C+3D. A solution was prepared by mixing 50 ml of .001 M of A, 100 ml of .002 M of B, 10 ml of 1 M of C, and 75 ml of .0015 M of D. At equilibrium, the concentration of D was measured and found to be .0006 M. Calculate the

    asked by Anonymous on January 26, 2014
  29. Chemistry

    If you dilute 14.0mL of the stock solution to a final volume of 0.350L , what will be the concentration of the diluted solution? Before it, there was a question: How many milliliters of a stock solution of 5.60 M HNO3 would you have to use to prepare

    asked by Danielle on September 27, 2014
  30. Chemistry

    If 25.0mL of sodium nitrate solution (0.100mol/L) is added to 10.0mL of sodium carbonate solution (0.150 mol/L), what is the concentration of sodium ions in the resulting mixture? Assume the volumes are additive.

    asked by Tom on May 13, 2009
  31. .Chemistry Help please?

    This type of question come in our exams usually that. If the Reaction P+Q β†’ R + S is described as being of zero order with respect to P, it means that. Answer: THE RATE OF REACTION IS INDEPENDENT OF THE CONCENTRATION OF P. I want to ask that, what is

    asked by Shahab Mirza on October 3, 2014
  32. chemistry

    If 8 cm3 of 9.9 mol m-3 Fe(NO3)3 are mixed with 10 cm3 of 1.0 mol m-3 KSCN solution in a 20 cm3 volumetric flask and water is added to bring the total volume up to 20 cm3, what is the concentration of the Fe3+ ions (in mol m-3)?

    asked by jessica on January 9, 2013
  33. Chemistry

    In an excess of NH3(aq), Cu2+ ion forms a deep blue complex ion, Cu(NH3)4^2+ (Kf=5.6x10^11). Calculate the concentration of Cu2+ in a solution adding 5.0x10^-3 mol of CuSO4 to .5 L of .4 M NH3

    asked by Bam on October 24, 2010
  34. chemistry

    A 13.0 mL sample of an unknown HClO4 solution requires titration with 25.2 mL of 0.180 M to reach the equivalence point. What is the concentration of the unknown HClO4 solution? The neutralization reaction is as follows: HClO4 +NaOH ===>> H2O +NaClO4

    asked by john on November 2, 2010
  35. chemistry

    Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0210 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? Ksp=1.20Γ—10^–5 silver sulfate ksp=4.93x 10 ^-5 calcium sulfate

    asked by alexa on April 10, 2014
  36. Chemistry

    A 0.108 M sample of a weak acid is 4.16% ionized in solution. what is the hydroxide concentration of this solution? I know that i set up an ice table. The equation would be weak acid + H20 goes to OH + the acid. What do i do with the 4.16 %? How does that

    asked by Anonymous on April 15, 2009
  37. chemistry

    hydrogen gas has a Henry's law constant of 1.07e-6 M/mm Hg at 25 Celsius when dissolving in water. if the total pressure of gas (H2 gas plus water vapor) over water is 1.0atm, what is the concentration of H2 in the water in grams per milliliter?

    asked by angel on August 22, 2014
  38. chemistry

    Why does the density of gas in a hot air balloon decrease as the gas is heated? A. The mass of gas decreases as temperature increases. B. The mass of gas increases as temperature increases. C. The volume of gas decreases as temperature increases. D. The

    asked by erika on September 14, 2016
  39. math-I just want this check because it will be gra

    Are these the correct answers and lables? 9. A hand lens increased the thickness of a line 10 to the 3rd power times.The line was 0.5 mm thick. How thick did the line appear? my ans.- 500 mm thick 10. A truck holds 10 to the 4th power times more pounds

    asked by chris on December 7, 2006
  40. Chemistry

    An experiment being conducted, the pressure is 0.9 atm and the temperature is 18 Β° C. One of the steps of experience requires the combustion of 500 ml of ethanol (d = 0.78 g / ml). Whereas the burning this amount of ethanol does not significantly alter

    asked by Kennia on January 21, 2016
  41. Chemistry

    Construct a standard curve (absorbance vs. concentration) using the following results. A 5mL, 10mL, 15mL,20mL aliquot of 0.010M sodium salicylate solution was diluted to 100 mL in four different volumetric flasks with the Iron (III) chloride solution. The

    asked by Ati on October 16, 2015
  42. Chemistry

    An experiment being conducted, the pressure is 0.9 atm and the temperature is 18 Β° C. One of the steps of experience requires the combustion of 500 ml of ethanol (d = 0.78 g / ml). Whereas the burning this amount of ethanol does not significantly alter

    asked by Kennia on January 22, 2016
  43. chemistry

    I have gotten the equilibrium concentrations of N202 to be 2M and N02 to be 2M also. After equilibirum is reached, a pistons is used to decrease the flask volume to 3L. Once equilibrium is established find the concentration and moles of each gas. K = 2 How

    asked by A on October 9, 2008
  44. Social Studies

    Why is urbanization associated with the industrial revolution? A. The expansion of family farms refocused the nation on agriculture. B. The concentration of factories in cities brought job opportunities. C. Settlers expanded the frontier west of the

    asked by Hehe on September 24, 2019
  45. History

    Why is urbanization associated with the Industrial Revolution? A. The expansion of family farms refocused the nation on agriculture. B. The concentration of factories in cities brought job opportunities. C. Settlers expanded the frontier west of the

    asked by Anonymous on November 17, 2018
  46. english

    correct the following tenese Concentration does not mean (1) think only one idea. Concentration means holding a central issue in mind while you (2)except or reject ideas that are related to that issue. In the words of F. Scott (3)(1896-1940), author of the

    asked by roza on February 26, 2010
  47. Language Arts

    1.Which Idea Is Conveyed In Both "Dust Of Snow" and Who Knows If The Moon's A.Nature can be playful (MY ANSWER) B.Nature can be harsh C.Nature can be annoying D.Nature can be mysterious 2.To Which Sense Do Both "Who Knows If The Moon's" and "Dust Of Snow

    asked by LOVE on February 22, 2016
  48. Math

    This may be confusing and I apologize. 1. What is the value of x? Round the answer to the nearest tenth. The diagram is not drawn to scale. The diagram is a circle with two triangles in the middle that touch the inside wall of the circle. where they meet

    asked by Tim on June 8, 2016
  49. Chemistry

    Find concentration acid in 50ml of 1.0 M NaOH is titrated with 75ml of sulfuric acid 2. 120cubic centimeter of 0.8m NaOH is titrated with 150cubic centimetre of nitric acid

    asked by Shingie on May 31, 2018
  50. Chemistry titrations

    25.00mL of an unknown sulfuric acid solution is titrated to the second equivalence point with 21.02mL of 0.420M potassium hydroxide solution. What is the concentration of the sulfuric acid solution?

    asked by Jaden on March 27, 2013
  51. chemistry

    The total phosphate concentration in a blood sample is determined by spectrophotometry to be 3.0Γ—10βˆ’3 M. The pH of the blood sample is 7.45, What are the concentrations of H2PO4βˆ’ and HPO42- in the blood? Pka for the phosphate system is 7.198

    asked by India on December 9, 2014
  52. Chemistry

    The position of the equilibrium for a system where k=8.4 x 10^-5 can be described as being favored to____; the concentration of product is relatively _____ Options The right, large The right small The left large The left small Neither direction large

    asked by Abby on November 17, 2019
  53. chemistry

    A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be ?M.

    asked by thuy on February 22, 2008
  54. General Chem

    The concentration of potassium ions inside a nerve cell is around 20 to 30 times that outside the cell. Calculate the potential difference between inside and outside a nerve cell, if it depends only on this ionic imbalance.

    asked by Anne on December 12, 2007
  55. Chemistry

    I have the same question as anonymous person before me so I just copy the question from that person, here is the question please help the two of us! if you have a mixture of sodium chloride and sodium bromide, could you use its conductance to determine the

    asked by Kim on January 9, 2013
  56. CHEM, please help!

    A 11 mL sample of a solution of AlBr3 was diluted with water to 23 mL. A 15 mL sample of the dilute solution was found to contain 0.045 moles of Br-. What was the concentration of AlBr3 in the original undiluted solution? answer is 2.09 but i cant get it.

    asked by Kate on February 16, 2012
  57. chemistry

    if it requires 35.0 milliliters of 0.50 molar NaOH to neutralize 25.0 milliliters of HCl, what is the concentration of the HCl solution? Balanced equation: NaOH + HCl yields NaCl + H2O

    asked by smith on November 17, 2010
  58. Chem

    consider the equilibrium reaction: pbcro4(s) pb^2+ (aq) +cro4^2- (aq). A saturated solution of lead chromate, pbcro4 has a lead ion concentration of 1.4 x 10^-7 m. what is the value of the solubility product ksp for lead chromate?

    asked by Mad on June 3, 2013
  59. Chemistry

    The half-life for beta decay of strontium-90 is 28.8 years. A milk sample is found to contain 10.3 ppm strontium-90. How many years would pass before the strontium-90 concentration would drop to 1.0 ppm?

    asked by Mindy on November 11, 2011
  60. chemistry

    If it requires 30.0 milliliters of 1.2 molar HCl to neutralize 20.0 milliliters of NaOH, what is the concentration of the NaOH solution? Balanced equation: NaOH + HCl NaCl + H2O (3 points)

    asked by Anonymous on June 22, 2011
  61. chemistry (Dr.Bob222)

    In a reaction, if the concentration decreases faster, that means the reaction has a larger rate constant, and a faster reaction, and a shorter half-life. Is that a correct statement? If not, please correct me, thanks for your help :)

    asked by K on October 2, 2013
  62. Chemistry

    A student titrates 0.100M KOH into 50.00 ml of weak acid HX. The pH of the solution is 4.25 after 20.00 ml of the base has been added, and equivalence point is reached when 40.00 ml of the base is added. 1. What is the concentration of the acid, HX ? 2.

    asked by Paul on March 9, 2011
  63. CHEMISTRY

    PartA: Ammonia,is a weak base with a Ka value of 1.8x10^-5 .What is the pH of a 0.22M ammonia solution? PartB: What is the percent ionization of ammonia at this concentration? I got the answer for PartA which is pH=11.3. but i cant slove PartB..HELP!!!

    asked by CHEMISTRY on March 2, 2009
  64. Math geometry

    An architect is designing an A-frame cottage for a resort. A cross section of the cottage is an isosceles triangle. The front wall of the cottage must accommodate a sliding door. Knowing that the architect is allowed a rectangular space of 240 mΒ³ in

    asked by Alex on December 28, 2015
  65. physics

    A house painter stands 3.0 m above the ground on a 5.0-m-long ladder that leans against the wall at a point 4.7 m above the ground. The painter weighs 680 N and the ladder weighs 120 N. Assuming no friction between the house and the upper end of the

    asked by nada on April 7, 2016
  66. Trigonometry

    I have three questions that I need help to answer. 1) a balloon on the end of a string attached to the ground is being blown by the wind. If the ballon us 12.75 m above the ground and the string makes an angle of 48 degrees to the horizontal, what is the

    asked by Jodie on August 20, 2014
  67. Chemistry

    3. What experimental problems would confront you if you attempted to determine the concentration of the metal ions in solutions of each of the following reagents? a. Cr +3 which has a maximum absorbance at 407 nm with absorbtivity of 15 M -1 cm -1 and

    asked by Joe on October 14, 2007
  68. Chemistry

    Citric acid H3C6H5O7, occurs in plants. Lemons contain 5% to 8% citric acid by mass. The acid is added to beverages and candy. An aqueous solution is 0.688m citric acid. The density is 1.049 g/ml. What is the molar concentration?

    asked by Lauren on February 7, 2008
  69. chemistry

    A 100.0 mL portion of 0.250 M calium nitrate solution is mixed with 400.0 mL of .100M nitric acid solution. What is the final concentration of the nitrate ion? BOB PURSLEY PLEASE EXPLAIN MORE THOROUGHLY HOW YOU GOT THE NITRATE ION TO BE .5M

    asked by alex on October 24, 2010
  70. Chemistry

    Citric acid H3C6H5O7, occurs in plants. Lemons contain 5% to 8% citric acid by mass. The acid is added to beverages and candy. An aqueous solution is 0.688m citric acid. The density is 1.049 g/ml. What is the molar concentration?

    asked by Lauren on February 7, 2008
  71. chemistry (acid-ionization constant)

    A 0.942 M sample of carbonic acid, H2CO3, has a measured hydronium ion concentration of 6.36 Β΄ 10–4 M. Calculate the acid-ionization constant of carbonic acid. The equilibrium equation is: H2CO3(aq) + H2O(l) H3O+(aq) + HCO-3(aq)

    asked by Lily on August 9, 2010
  72. Chemistry

    The FDA recommends that adults ingest less than 2.4 g of sodium per day. How many liters of softened water, containing a sodium concentration of 0.050% sodium by mass, have to be consumed to exceed the FDA recommendation? (Assume a density of 1.0 g>mL for

    asked by Cloey on April 13, 2012
  73. chemistry

    What must be the minimum concentration of dichloroacetic acid in 1.00L buffer solution of a pH 0.91 dichloroacetic acid/sodium dichloroacetate buffer if the pH changes by 0.2 units when 0.057 moles HCl are added? Dichloroacetic Cl2CHCOOH ka= 5.50E-02 pka=

    asked by Antonette on February 5, 2015
  74. CHEMISTRY

    When NO(g) (0.06623 mol/L) and 422.6 grams of Cl2(g) in a 180.0 L reaction vessel at 565.0 Β°C are allowed to come to equilibrium the mixture contains 3.096 mol of NOCl(g). What is the concentration (mol/L) of NOCl(g)? 2NO(g)+Cl2(g) = 2NOCl(g)

    asked by ANNA-MARIE on April 19, 2011
  75. Biology

    You have a stock solution with following components: glucose: 44 g/L NaCl: 191 g/L Tris Buffer: 275 g/L You mix 71 mL of the solution with water and bring the resulting solution to a final volume of 750 mL. What is the final concentration of glucose in

    asked by Dee on February 10, 2015
  76. Chemistry

    At 100 degrees C, pure H2O has a vapor pressure of 760 torr. An aqueous solution has a concentration of 1.90 M MgCl2. The van't Hoff factor is 2.45. The density of the solution is 1.09 g/mL. Calculate the vapor pressure of the solution.

    asked by Ayaka on May 24, 2016
  77. Chemistry

    Formamide, HCONH2, is used to manufacture agricultural chemicals, dyes, and pharmaceuticals. At 125 degrees Celcius, formamide decomposes. HCONH2 NH3 +CO if Keq is 4.8 and the concentrations of NH3 and CO are both .20 mol/L at equilibrium, what is the

    asked by Alena on September 23, 2019
  78. Chemistry a level

    A solution of potassium permanganate (KMnO4) was standardised by titrating with 0.20 g of Na2C2O4 dissolved in 50 cm3 of acidified water. The endpoint was reached after 23.10 cm3 of solution had been added. Calculate the molar concentration of KMnO4 in the

    asked by Rob on October 16, 2016
  79. Chemistry

    The FDA recommends that adults ingest less than 2.4 g of sodium per day. How many liters of softened water, containing a sodium concentration of 0.050% sodium by mass, have to be consumed to exceed the FDA recommendation? (Assume a density of 1.0 g>mL for

    asked by Cloey on April 13, 2012
  80. chemistry

    Acetic acid (CH3COOH) has a Ka of 1.8x10^-5. a buffer is to be prepared with a pH of 5.00 from solutions of CH3COOH and sodium acetate (NaCH3COO) of the same concentration. How many mLs of NaCH3COO would have been added to 100 mL of CH3COOH to make the

    asked by robyn on November 19, 2013
  81. Chemistry

    Write the balanced neutralization reaction between H2SO4 and KOH in aq. solution. .350 L of .410 M H2SO4 is mixed with .300 L of .230 M KOH. What concentration of sulfuric acid remains after neutralization? ______ M H2SO4

    asked by Chelsea on October 4, 2013
  82. chemistry

    A 0.942 M sample of carbonic acid, H2CO3, has a measured hydronium ion concentration of 6.36 Β΄ 10–4 M. Calculate the acid-ionization constant of carbonic acid. The equilibrium equation is: H2CO3(aq) + H2O(l) H3O+(aq) + HCO-3(aq)

    asked by Lily on August 9, 2010
  83. Reading

    Read each sentence. On the lines provided,write simple if it has one independent clause. Write compound if it has two or more independent clauses. Write compound if it has two or more independent clauses. 1. I wanted to go to the concert,but my parents

    asked by Camille on September 22, 2014
  84. chemistry

    Two containers of equal volume are separated by a membrane that allows free passage of water but completely restricts passae of solute molecules. Into which compartment will water flow, or will there be no net movement of water? Which solution is at the

    asked by rena on August 8, 2013
  85. physical science

    Since October 2004, Jack Daniels Tennessee whisky, produced in Lynchburg, TN, has been bottled at 80 proof (40% alcohol by volume). Given that the density of ethyl alcohol is 0.789 g/cm3, and that of water 1.00 g/cm3, calculate the concentration of the

    asked by brandi on March 13, 2012
  86. chemistry

    Since October 2004, Jack Daniels Tennessee whisky, produced in Lynchburg, TN, has been bottled at 80 proof (40% alcohol by volume). Given that the density of ethyl alcohol is 0.789 g/cm3, and that of water 1.00 g/cm3, calculate the concentration of the

    asked by brandi on March 13, 2012
  87. chemistry

    Two containers of equal volume are separated by a membrane that allows free passage of water but completely restricts passae of solute molecules. Into which compartment will water flow, or will there be no net movement of water? Which solution is at the

    asked by rena on August 8, 2013
  88. chemistry

    A chemist must dilute 55.6 ml of 1.48 M aqueous silver nitrate (AgNO3) solution until the concentration falls to 1.00M. He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in

    asked by Lizzy on August 31, 2012
  89. Chemistry

    A is a 4.5g of HNO3 per 1dm^3 of solution. B is a 7.0g of [XHCO3]SOH per 1dm^3 of solution. 25cm^3 of B was pipetted and titrated with A using methyl orange as an indicator. Given the titre volumes of A used to be 29.20, 29.10 and 29.30, calculate a. The

    asked by Dennis on August 22, 2019
  90. Chemistry help

    Average human blood serum contains 18 mg of K+ Calculate: a) the molar concentration for each of these species; use 1.00 g/mL for the density of serum. I have worked as of this (18 mg K+/100 mL)(1mL/1g)(1 mmol/39.10mg)(1g/1000mg). But it seems that some

    asked by xavier on July 7, 2013
  91. Chem I

    Ok here is another one! Concentrated aqueous HClO4 has a concentration of 14.8 M. Calculate the concentrations of ALL ions present in a solution prepared by pipetting 5.00mL of concentrated HClO4 into a 1000.0-mL volumetric flask and filling to the mark.

    asked by Natalea on November 15, 2010
  92. chemistry

    I am having a hard time with this problem. I was wondering where I went wrong. The problem says The equilibrium constant, Kc, for the reaction of H2 and N2 is 1.7Γ—10^2 at 225 ∘C. 3H2(g)+N2(g)←→2NH3(g) If the system at equilibrium contains 0.16M H2

    asked by chelsea on November 13, 2013
  93. Chemistry

    The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. Please help it

    asked by shannon on May 13, 2013
  94. College Chemistry

    The concentration of lead ions (Pb^2+) in a sample of polluted water that also contains nitrate ions (NO3) is determined by adding solid sodium sulfate (Na2SO4) to the sample of the water. Write the net ionic equation for the reaction. Do not forget to

    asked by KELLY on September 27, 2010
  95. AP Chemistry

    An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M I

    asked by Anonymous on September 20, 2015
  96. Chemistry

    A solution of aniline(C6H5NH2, Kb=4.2x10^-10) has a pH of 8.69 at 25 Celsius. What was the initial concentration of aniline? I have so far don't know if it's right: *. [H3O]=10^-8.69=2x10^-9 * 4.2x10^-10=(2x10^-9)^2 / x X=1.2x10^-8 (correct???)

    asked by V on March 20, 2013
  97. Physics

    A plank, of length L = 3.7 m and mass M = 19.6 kg, rests on the ground and on a frictionless roller at the top of a wall of height h = 1.70 m (see Figure). The center of gravity of the plank is at its center. The plank remains in equilibrium for any value

    asked by Anonymous on September 17, 2018
  98. Math

    A framed picture 20 inches wide and 36 inches high is shown in the diagram below. The picture will be hung on a wall where the distance from the floor is 10 feet. The center of the picture frame must be 2 3/4 feet from the floor. A) determine the distance

    asked by Brooke on June 27, 2016
  99. Chemistry

    A salt solution is evaporated to dryness. If 66.5 g of the solution leaves 1,492 mg of dry salt, what is the percent concentration (w/w) of the salt in the solution?

    asked by Marsha on May 6, 2013
  100. Chemistry Solutions

    Commercial Sodium hydroxide has a concentration of 19.4mol/L. How many milliliters of sodium hydroxide solution can be prepared from 59g or sodium hydroxide.

    asked by Isaac on November 5, 2016