1. chemistry

    when 12.76mL of HCl of unknown concentration (but less than the base) are reacted with 15mL of 3.254M NaOH, 1.68kJ of heat are released. What is the molarity of the HCl solution?

    asked by serena on November 23, 2010
  2. chemistry

    Complete the mass balance expression for a saturated solution of Ag2CO3. Note at least one blank is a numeric coefficient. (Note: Ignore any subsequent reactions of Ag .)

    asked by Lana on May 19, 2013
  3. Chem

    In a titration process it takes 22.00 mL of nitric acid to neutralize 16.70 mL of 0.200 M calcium hydroxide solution. what is the balanced equation and what is the molarity of the acid. please explain

    asked by Piper on June 13, 2012
  4. Physics

    A 4600 kg helicopter accelerated upward at 5 m/s^2. What lift force is exerted by the air on the propellers? --Would the downward force of gravity play a part in the solution?

    asked by Anonymous on September 19, 2007
  5. Chemistry

    A 0.140-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co^2+ ions at equilibrium? Assume the formation constant of Co(NH3)6^2+ is 5.0× 10^31.

    asked by Sarah on May 11, 2012
  6. Chemistry

    Marcela dissolves 80.0 g of ammonium nitrate in 50.0 mL of water at room temperature and notes that the temperature of the solution decreases by 5.0°C. Which correctly designates the signs of changes of G, S and H for this reaction?

    asked by Damon on July 16, 2016
  7. Chem 1A

    The following reaction occurs in aqueous acid solution: NO3– +I– →IO3– +NO2 In the balanced equation, using the smallest whole-number coefficients, what is the coefficient of NO3–?

    asked by Parkin on November 12, 2012
  8. chemistry

    If 1373 g of a substance is dissolved in 2315 g of cyclohexane solvent, the boiling point of the solution is 87.69 oC. Calculate the apparent molar mass (g/mol) of substance.

    asked by eng on January 31, 2010
  9. Chemistry

    Please help! Thanks. An ammonia solution is made by diluting 0.105L of the concentrated commercial reagent until the final volume reaches 1.00L. What is the final molar concentration?

    asked by Sydney on July 19, 2009
  10. Chem

    Write the balanced net ionic equations for the reaction of a) added H+ and B) added OH- with the components of the acetic acid/sodium acetate buffer solution:

    asked by Bubba on February 9, 2011
  11. Chemistry

    What is the maximum mass of copper(ii) sulphate pentahydrate, CuSO4.5H2O, which could be obtained by crystallizing the solution? Ar: H=1; O=16; S=32; Cu=63.5 I'm not looking for someone to do it all, although that would help. Just that someone could give

    asked by Owen on December 3, 2015
  12. chemistry

    A 20.0 mL sample of 0.687 M HBr is titrated with a 0.216 M NaOH solution. The pH after the addition of 10.0 mL of NaOH is __________. A. 0.413 B. 0.386 C. 0.163 D. 0.579 E. 0.237

    asked by katie on July 24, 2012
  13. math

    The farmer wants to use the 500 m to an enclosure divided into two equal areas, What is the total maximum area that can is achieved with the 500 m fence. using differential calculus to the solution.

    asked by gordana on September 14, 2014
  14. math

    Find the exact value of the volume of a can of green beans with a diameter 8 centimeters and height of 12 centimeters. Include correct units with your solution. Use "pi" in place of the pi symbol.

    asked by kozy on May 8, 2011
  15. chemistry

    50ml of 20.8% bacl2 and 100ml of 9.8% h2s04 solutions are mixed. Molarity of cl ions in the resulting solution wt of ba =137 I do not still understand step by step clearly Thank a lot

    asked by Ken on November 23, 2014
  16. chemistry

    A 0.100 M solution of K2SO4 would contain the same total ion concentration as which of the following solutions? A. 0.0800 M Na2CO3 B. 0.100 M NaCl C. 0.0750 M Na3PO4 D. 0.0500 M NaOH

    asked by Michael on March 27, 2012
  17. chemistryt

    A solution with a volume of 1·00 dm3 is saturated with lead iodide, Pbl2. The concentration of iodide ions is 2·7 mol dm–3.Determine the solubility product of PbI2. 

    asked by sayan on June 5, 2017
  18. chemistry

    0.10 M potassium chromate is slowly added to a solution containing 0.50 M AgNO3 and 0.50 M Ba(NO3)2. What is the Ag+ concentration when BaCrO4 just starts to precipitate? The Ksp for Ag2CrO4 and BaCrO4 are 1.1 x 10-12 and 1.2x10^-10 respectively

    asked by emoni on January 16, 2011
  19. chemistry

    When 0.025 moles of aluminum sulfate are dissolved in enough water to make 115 milliliters of solution, what is the molarity of sulfate ions? Answer in units of M

    asked by cheri on September 13, 2012
  20. Chemistry

    A student prepared 200mL of 0.01M solution of calcium phosphate, Can(PO4)2. What is the concentration of calcium in parts per million? Relative atomic masses Can =40, P =31, O =16

    asked by Sylvia on April 9, 2018
  21. Canada Government

    I learn about canada government. I from India. There questions I don't understand. 1. Why do some politicians think that the senate should be reformed? Identify a possible solution to the issue of Senate reform.

    asked by Aishwariya on March 29, 2011
  22. Chemistry-Answer & Solution please!~

    An AM radio statrion broadcasts atr 1060jGHZ Calculate tghe wavelength of the coressponding radio waves. Ned solution amdhow to get the answr! Thank you!

    asked by KL on May 4, 2012
  23. Chemistry

    Pyridine, a substance used as a catalyst in some synthetic reactions is a very weak base its degree of ionization is equal to 0.03% in solution 0.02 mol L -¹. Determine the ionization constant.

    asked by Michael on February 23, 2016
  24. Algebra

    find three consecutive positive even integers such that the product of the second and third integers is twenty more than ten times the first integer. [only an algebraic solution can give full credit]

    asked by Alexis on May 23, 2010
  25. chemistry

    Describe the circumstances in which the following processes could be used to separate the components of a mixture. -sublimation -crystallization -evaporation of a solvent from a solution -dissolving of an impure substance in a solvent

    asked by cara on January 27, 2016
  26. Chemistry

    For a particular redox reaction NO2– is oxidized to NO3– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in basic solution. Phases are optional.

    asked by Connor on April 1, 2013
  27. physics

    a body displaced 12m due to east 5m due to north then 9m vertically upward what is the resultant displacement?solution with complete reason n figure

    asked by armando on August 12, 2011
  28. Chemistry

    0.222g of a divalent metal is deposited when a current of 0.45ampere is passed through a solution of salt for 25min. Calculate the relative atomic mass of the metal

    asked by Anonymous on August 22, 2018
  29. chemistry

    Ba(OH)2(aq) + HCl(aq) BaCl2(aq) + H2O (g) Consider the unbalanced equation above. What is the concentration of the original hydrochloric acid solution if 18.0 mL of the acid reacts with 45.5 mL of 0.280 M barium hydroxide?

    asked by zack on June 20, 2016
  30. SCIENCE

    AIR IS A COMPOUND of nitogen,oxygen,argon,carbon dioxide,ane other gases.how may air be best described? a)a compund b)a mixture c)a solution d)an alloy e)an amalgam

    asked by jessica on October 3, 2007
  31. chemistry

    What mass of cesium bromine must be added to a 0.500 liter of water (d=1.00 g/ml) to produce a 0.981m solution? what are the mole fraction and mass percent of CsBr?

    asked by sabrina on September 8, 2014
  32. chemistry

    it is desired to prepare 250.0mL of a standard solution having a concentration of 0.1000M AgNo3. How many grams of a sample of AgNO3 of 98.8% purity are required for this purpose?

    asked by T on March 25, 2010
  33. Chemistry

    an acid base titration is conducted in which 20 ml of LiOH is added to 10ml of .200M HBr to reach the equivilance point. what is the molarity of the LiOH solution?

    asked by Elf on April 12, 2010
  34. chemistry

    it is desired to prepare 250.0mL of a standard solution having a concentration of 0.1000M AgNo3. How many grams of a sample of AgNO3 of 98.8% purity are required for this purpose?

    asked by T on March 25, 2010
  35. chemistry

    How many grams of potassium hydrogen phthalate should be added to a 100 mL volumetric flask to prepare a 0.5000 M solution when the flask is diluted to the mark with water?

    asked by Shell on May 19, 2011
  36. science

    calculate the % of compound A extrcted if an aqueous solution containing 5.0g/100 ml is extracted with 33ml of diethyl ether thrice.(partition for ether-water distribution=4:1)

    asked by Nadeeshani on July 12, 2011
  37. Chemistry

    If 395.3 g of a substance is dissolved in 872.6 g of cyclohexane solvent, the boiling point of the solution is 87.38 oC. Calculate the apparent molar mass (g/mol) of substance.

    asked by Tylor on May 4, 2009
  38. Chemistry PLEASE HELP!

    When 0.042 moles of aluminum sulfate are dissolved in enough water to make 763 milliliters of solution, what is the molarity of sulfate ions? Answer in units of M.

    asked by Mike on October 11, 2010
  39. motion problem

    A man rowed 30km downstream. it took him 2hrs more time in going back than in going downstream. if the current is 2kph, what is his speed in still water? (with solution pls... tnx)

    asked by MNHS MNHS on November 12, 2013
  40. Chemistry

    Describe in detail how you would make one molar solution of sodium chloride. Do I add the atomic masses of Na and Cl and then find the mols? And the after that you would just add 1L of water, correct?

    asked by ~Brittney~ on August 28, 2007
  41. Chemistry

    Problem: A gaseous mixture of O2 and Kr has a density of 1.181 g/L at 485 torr and 300. K. What is the mole percent O2 in the mixture? Attempt: I have tried everything possible that I know and I can't get anywhere close to the solution. d=m/v=pM/RT...

    asked by Chase on August 28, 2007
  42. chemistry

    If 1373 g of a substance is dissolved in 2315 g of cyclohexane solvent, the boiling point of the solution is 87.69 oC. Calculate the apparent molar mass (g/mol) of substance.

    asked by eng on January 31, 2010
  43. Chemistry

    a solution of 4.65 of a carbohydrate in 100.0g of water has a density of 1.016g/mL and an osmotic pressure of 3.18 atm at 20.0 degrees celcius. calculate the molar mass of the carbohydrate.

    asked by Amy on February 15, 2011
  44. Chemistry

    To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) -> 4 NaAu(CN)2(aq) + 4 NaOH(aq)

    asked by Amy on February 9, 2010
  45. chemistry

    How many grams of solid sodium sulfate can be added to 1000L of a 0.02mol/L solution of calcium chloride before a precipitate forms? (Ksp for calcium is 6.1x10^-5)

    asked by Kat on July 27, 2010
  46. Chemistry

    in a neutralization reaction, dilute tetraoxosulphate (vi) acid completely reacted with sodium hydroxide solution.write a balanced chemical equation for the reaction

    asked by Donniceski on March 14, 2017
  47. Chemistry

    What will be the volume of concentrated H2SO4 that must be added to 155 mL of 0.1996 N H2SO4 in a 500 mL volumetric flask so that the resulting solution will be 6.5210 M? pls. explain.

    asked by Summer on January 21, 2014
  48. Chemistry

    What is the concentration of an HCl solution if 23.1 mL of HCl are needed to neutralize completely 35.0 mL of 0.101 M Ba(OH)2 I cannot get the right answer (Macic)(23.1mL)=(0.101M)(35.0mL) Macid = .153

    asked by corey on December 5, 2011
  49. math

    4x^2+11x-69=0 Find the solution to use a comma to separate the answers as needed. X^2+11x What is the constant term?(Integer or simplified fraction) 1/6 gt y= (rationalize all Denominators)

    asked by vicky on February 16, 2013
  50. Chemistry

    a 40.0 ml sample of ca(oh)2 was titrated with 0.0704 m hcl. the volume of hcl needed to reach equivalence point was 18.2 ml. what was the concentration of ca2+ present in the original solution?4

    asked by Dahnrae on April 22, 2015
  51. Anatomy

    Is osmotic pressure the hydrostatic pressure on the side of a semiperable membrane containing the hypertonic solution which opposes the movement of water particles and can therefore stop osmosis? T OR F

    asked by Amanda on September 12, 2007
  52. Chemsitry

    For a particular redox reaction NO2– is oxidized to NO3– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in basic solution. Phases are optional.

    asked by Connor on April 1, 2013
  53. Chemistry

    In every electrolytic and galvanic (voltaic) cell the anode is that electrode (A) at which oxidation occurs. (B) which attracts cations. (C) at which electrons are supplied to the solution. (D) at which reduction occurs.

    asked by LT on May 12, 2008
  54. Science

    How many grams of hydrogen chloride are percent in 250cm3 of comercial 37% by mass hydro chloric acid solution? The density of the acid is 1.19gram/cm3.

    asked by Anonymous on July 26, 2016
  55. Chemistry

    A 0.225g sample of a weak monoprotic acid requires 37.50 mL of 0.100 M NaOH solution to reach the equivalence point. What is the molar mass of the acid?

    asked by Sarah on April 11, 2011
  56. chemistry

    A 0.5215 gram sample of CaCO3 is dissolved in 12M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask. How many moles of CaCO3 are used?

    asked by saddee on April 28, 2009
  57. Quantitive Analysis

    Calculate the volume (in mL) of 0.170 M NaOH that must be added to 361 mL of 0.0491 M 3-(N-Morpholino)propanesulfonic acid (MOPS) to give the solution a pH of 7.55. The pKa of MOPS = 7.18.

    asked by Amanda Getto on October 18, 2015
  58. CHEMISTRY

    Using a 0.20 M phosphate buffer with a pH of 6.5, you add 0.72 mL of 0.46 M NaOH to 58 mL of the buffer. What is the new pH of the solution? (Enter your answer to three significant figures.) I don't even know where to begin!! I just need a set up of the

    asked by Mack on March 3, 2015
  59. trigonometry

    Can you draw the The solution for this: Establishing identities 1.) Sin²∅ (1+cot²∅) = 1 2.) (tan²B+1) cos²B = 1 3.) tan x ---------- = sin x sec x 4.) 1 1 ------- + ------- = 2csc²∅ 1+cos∅ 1-cos Please help me, i cant understand it.

    asked by alyn on January 20, 2015
  60. chem

    How many grams of potassium permanganate (KMnO4) should be added to a 100 mL volumetric flask to prepare a 0.02505 M solution when the flask is diluted to the mark with water?

    asked by Amber on May 18, 2011
  61. chemistry

    One gram of pbcl2 is dissolved in 1.0 l of hot water. When the solution is cooled to 25degrees Celsius, will some of the pbcl2 crystallize out? If so, how much? I just don't know where to start/ where to go with this problem Any help is appreciated!!

    asked by Anonymous on March 24, 2015
  62. Sci

    when a large amount of FeCl3 is dissolved in water, a clear solution is formed at the beginning but eventually a precipitate is formed. Why? Explain with chemical equation.

    asked by T on March 2, 2013
  63. Chemistry

    which of thh following reactants would you add to an aqueous solution of ammonium sulfate in order to precipitate quantitatively all the sulfate? A. CaCl2 b. Al(NO3)3 c. Zn(C2H3)2)2 d. KBr

    asked by Rosebud on April 27, 2012
  64. CHEM 111

    Calculate the pH of the solution that results from the addition of 12.00mL of 0.225M HNO3 to 20.00mL of 0.210M NH3. Buffer titration problem. Do I find moles and then???

    asked by Anonymous on June 12, 2011
  65. chemistry

    suppose 100 g of lead nitrate salt is added to enough water to make 1 L of solution, what is the concentration of the lead ion in the moles per liter in each of the solutions?

    asked by Anonymous on September 29, 2010
  66. AP Chemistry

    A 500ml saturated solution of MgCO3 (M=84) is reduced to 120 ml by evaporation. What mass of solid MgCO3 is formed? The answer is 0.20g, I just need a detailed explanation. Thanks!

    asked by John on April 1, 2011
  67. chemistry

    an auto mechanic spills 85 mL of 2.4 M H2SO4 solution from a rebuilt auto battery. how many mL of 1.2 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid?

    asked by james on November 3, 2008
  68. Chemistry

    In studying the chemistry and qualitative analysis of anions, why wouldn't HCl be a good acid to use to determine the solubility of a silver precipitate in acid solution?

    asked by Matt on April 29, 2010
  69. chemistry

    suppose 100 g of lead nitrate salt is added to enough water to make 1 L of solution, what is the concentration of the lead ion in the moles per liter in each of the solutions?

    asked by Anonymous on September 29, 2010
  70. Chemistry

    Calculate the mass of urea required in making 2.5kg of 0.25 molar aqueous solution? which formula should I use mass by volume percentage or molality.help me out plz

    asked by Gash on March 2, 2019
  71. Chemistry

    when a certain amount of calcium chloride (CaCl2) was dissolved 100.g of water, the boiling point rose from 100.0*C to 104.4*C; calculate the molality of this solution.

    asked by James Dickenson on March 7, 2016
  72. chemistry

    At what point in the concentration of the weak acid or conjugate base does the buffer solution stop resisting a PH change when strong acid is added ? Thank for helping

    asked by Namis on October 23, 2011
  73. Chemistry

    For the strong acids find the [H3O]and [OH] in a solution that is .785% HNO3 by mass (assume a density of 1.01 g/ml). If someone could offer step by step instructions, that would be terrific!

    asked by Beth on April 29, 2012
  74. chemistry

    How many milliliters of concentrated nitric acid, HNO3, 70 % (wt/wt) are required to prepare 1 liter of 0.250 M solution? The molar mass and density of HNO3 are 63.0 g/mol and 1.36 g/cm respectively.

    asked by karen on November 4, 2016
  75. chemistry

    Somewhat confused... my homework is asking me to calculate morality of sodium thiosulfate from a 55 ml solution. the sodium's volume is 50 ml and has a concentration of 0.25M. The rest of the 55ml comes from the 5ml of HCL.

    asked by Molarity on September 16, 2011
  76. AP Gov:US

    List three problems of decentralized power that existed under the Articles of Confederation. For each problem you listed, indentify one solution that the Constitution provided to address the problem.

    asked by Dorcas on January 19, 2012
  77. pre ap chemistry

    you will need to explain in detail how to make 100.0 ml of a 0.500M CUSO4.5H20(s) SOLUTION. BE SPECIFIC about the measurements you would make and the type of equipment you will use . write out steps

    asked by nissa on April 26, 2015
  78. chemistry please

    find molar concentration of the solution. .128 g of benzophenone and fill in a beaker with ethanol to the 50.00mL line i came up with 3.5 x 10^-5 (0.128)(1/182.217)(.049872)

    asked by john on February 1, 2009
  79. chem

    find molar concentration of the solution. .128 g of benzophenone and fill in a beaker with ethanol to the 50.00mL line i came up with 3.5 x 10^-5 (0.128)(1/182.217)(.049872)

    asked by john on February 1, 2009
  80. chemistry

    Calculate the equilibrium vale of Pb +2 (aq) in 1.00 L of saturated PbCl2 solution to which 0.250 mole of NaCl has been added. 60.0 ml of 0.0300 M NaCl 60.0mL of 0.0500 M Pb(NO3)2

    asked by Carlos on April 13, 2011
  81. Chemistry

    430 mL of 0.044 M perchloric acid is added to 681 mL of 0.085 M hydroiodic acid. Calculate the pH of the resulting solution of strong acids at 25 °C. Please help. I am confused on how to do this

    asked by Sri2734 on October 20, 2017
  82. chemistry

    If the 12.5ml of NaOH solution is required to react completely with 0.300g of KHP (Potassium Hydrogen Phthalate, 204.2g/mol). What is the molarity of NaOH?

    asked by paul on December 11, 2012
  83. Chemistry 2

    The molar heat of solution of ammonia is −30.50 kJ/mol. What happens to the temperature of water when ammonia is added to it? I simply don't know how to answer this and wouldn't ask otherwise. I would be very grateful for assistance.

    asked by Eric on February 12, 2017
  84. chemistry

    2 solids samples each contain sulfer, oxyegen, and sodium only. These samples have the same color, melting point, density, and reaction with an aqueous barium solution. Are they solutions?

    asked by lauren on October 2, 2010
  85. Chemistry

    When 0.078 moles of aluminum sulfate are dissolved in enough water to make 634 milliliters of solution, what is the molarity of sulfate ions? Answer in units of M.

    asked by Cheyenne on September 23, 2010
  86. math

    Describe a simple process for using rates and unit prices that might help someone who is having difficulty understanding these concepts. Include either an example from the text or one of your own examples to explain the solution process. I need help

    asked by on June 30, 2010
  87. chem

    The accepted density of the sugar solution is 1.392 g/mL . Based on the average value of each data set, rank the data sets in decreasing order of accuracy.

    asked by Anonymous on September 20, 2015
  88. Molarity question!! please help urgently!

    Suppose you wanted to produce an aqueous solution of pH = 8.70 by dissolving one of the following salts in water: NH4Cl, KHSO4, KNO2, NaNO3. Use salt KNO2. But at what molarity? Please help!! Thank you!

    asked by Sara on February 17, 2017
  89. chemistry

    A 3.664 g sample of monoprotic acid was dissolved in water and required 20.27 mL of a 0.1578 M NaOH solution for neutralization . Calculate the molar mass of the acid

    asked by TROUBLED on October 11, 2011
  90. Chemistry

    How many mL of concentrated HCl(aq) (36% HCL by mass, d=1.18g/mL_ are required to produce 12.5 L of a solution with ph = 2.10? First I started with finding out the concentration of [H30+] and for that I got 7.94 x 10^-3 but I don't know how to continue.

    asked by K on June 7, 2011
  91. Calculate Osmotic Pressure

    69.7 grams of a solute with a molecular mass of 2790 grams are dissolved in enough water to make 1.00 dm3 of solution at 20 degrees C. What is the osmotic pressure of the soluton?

    asked by Jose Reyes on December 7, 2010
  92. chemistry

    When referring to percent ionization values given in a acid/base table, how to determine what is the hydrogen ion concentration of a 0.10 mol/L solution of hydrofluoric acid?

    asked by Jay on April 8, 2008
  93. Chemistry

    If 406.6 g of a substance is dissolved in 879.1 g of cyclohexane solvent, the boiling point of the solution is 87.52 oC. Calculate the apparent molar mass (g/mol) of substance.

    asked by adam on March 2, 2010
  94. chemistry

    A 0.109g sample of a pure gaseous compound occupies 112ml at 100degrees and 750torr: what is the molecular weight of the compound. ANS=(30.2g,mol). Please I need the solution

    asked by charles on March 21, 2016
  95. Ap chemistry

    What is the approximate molar fraction of ethanol c2h5oh in an aqueous solution in which the ethanol concentration is 11.0 molal? A. 0.0011 B. 0.011 C. 0.170 D. 0.200 E. 0.600

    asked by Lacey on May 8, 2013
  96. chemistry

    A compound has the empirical formula CH2O. When 0.0866 g is dissolved in 1.0 g of ether, the solution’s boiling pint is 36.5oC. Determine the molecular formula of this substance

    asked by Danica on October 1, 2012
  97. Chemistry

    The density of concentrated sulfuric acid is 1.84 g/mL. If this corresponds to 18 M, what is the molality of the solution? Molar mass= 98. 98 x 18 =1764g/L - 1.84 =1762.16/1000 = 1.76 kg 18/1.76=10.23 m But my only options are: a) 18 m b) 95.5 m c) 240 m

    asked by ramire2 on May 5, 2013
  98. Chemistry

    What is the density of an aqueous solution of potassiu nitrate that has normal boiling point of 103 celsius and an osmotic pressure of 122 atm at 25 celsius?

    asked by Anmol on February 20, 2010
  99. chemistry

    Groundwater in Pherric, New Mexico, initially contains 1.800 mg/L of iron as Fe3+. What must the pH be raised to in order to precipitate all but 0.3 mg/L of the iron? The temperature of the solution is 25 degree Celsius.

    asked by Jazmin on January 21, 2011
  100. Chemistry

    If the unknown tri protic acid has an equivalent weight of 46.79 g/equiv, its average molecular weight is ?g/mol and ?g would be required to make 100.00 mL of a 1.50 N solution.

    asked by mia on April 2, 2008

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