1. Math: PLEASE HELP

    3. Which of the following is a solution of x² + 14x + 112 = 0? If necessary, round to the nearest hundredth. A.) x = –0.24 B.) x = –4.24 C.) 4.24 *D.) no solution Thank you

    asked by cassie on February 28, 2013
  2. Chemistry

    1. I have 2% NaCl solution. From this I want to prepare a solution to contain 0.1 g of the sodium compound in 2 mL of water. Thanks

    asked by Steve on January 18, 2013
  3. chemistry

    what is the molar concentration of a solution containing 15,0 g of pottasium chloride in 1,30 dm3 of solution

    asked by Anonymous on August 18, 2014
  4. Chemistry

    How many milliliters of 2.00 M NaHO solution are needed to neutralize a 8.00 mL of 3.50 M H2SO4 solution?

    asked by Hailey on February 29, 2016
  5. molarity

    calculate the molarity of a solution containing 4.50mmol of NaCl in 3.80mL of solution

    asked by jazmin on May 17, 2010
  6. Science

    100ml of 1.0 m KOH solution will neutralize 100 ml of 1.0 M H2SO4 solution Thank you!

    asked by Sarah on March 16, 2018
  7. chem

    How many milliliters of a 15.0%, by mass solution of {KOH}(aq) (d = 1.14 g/mL) are required to produce 25.0 L of a solution with pH = 11.60?

    asked by help!!! on February 16, 2009
  8. science(chem)

    [b]1.[/b]Is TLC a qualitative or quantitative analysis? Is there any way that it can be both? Explain. ~I say it can be both since it can be used to go and determine what exactly is in a sample of mixed compounds which would be qualitative analysis. It can

    asked by ~christina~ on October 13, 2007
  9. Algebra

    a chemist wants to mix a 22 acid solution with a 46% acid solution to get 32 gallons of 37% acid solution. How many gallons of the 22% acid solution and how many gallons of the 46% acid solution should be mixed?

    asked by Anonymous on December 11, 2017
  10. Math

    What volume, in ml, of a 60% of HCl acid solution must be added to 100 ml of a 30% HCl solution to make a 36% HCl solution. We need 2 alegabreic (?) equations. The first I can get is: 0.36x - 0.60y = 100ml (this is probably wrong)? Blah. I can't get the

    asked by Ariel on January 31, 2007
  11. Chemistry

    Thank you for being helpful in the past. Could you check my interpretation of the three chemical word problems below,and,let me know if I'm on the right track? 1.Determine the mass of water vapor formed when 1.00g of Butane (C4H10)is burned in a

    asked by Cliff on November 3, 2010
  12. Chemistry

    The experiment that I did in lab consisted of performing a qualitative analysis of group 1 and 2 cations and anions. The first thing that I did was to add 5 drops of 3M HCl, centrifuge it, and to observe whether a precipitate would form. It did and in the

    asked by David on April 12, 2009
  13. chemistry

    Calcium is determined gravimetrically by precipitating it as CaC2O4â‹… H2O, followed by isolating the precipitate as CaCO3. The sample to be analyzed is dissolved in 10 mL of water and 15 mL of 6 M HCl. After dissolution, the resulting solution is

    asked by anonymous on April 4, 2017
  14. Physics

    Suppose you measure a standing person's blood pressure by placing the cuff on his leg 0.580 m below the heart. Calculate the pressures you would observe if the pressures at the heart are 121 over 80 mm Hg. Assume there is no loss of pressure due to

    asked by Kenzie on November 16, 2015
  15. chemistry(rusting)

    i know that metal placed in more acidic solution will produce rust faster.but why metal placed near the sea shore will easily have rust?the wind with moisture which contains salt solution,right? however ,i have a problem.When i put the metal in the test

    asked by Kong on November 8, 2011
  16. chemistry(rusting)

    i know that metal placed in more acidic solution will produce rust faster.but why metal placed near the sea shore will easily have rust?the wind with moisture which contains salt solution,right? however ,i have a problem.When i put the metal in the test

    asked by Kong on November 8, 2011
  17. chemistry(rusting)

    i know that metal placed in more acidic solution will produce rust faster.but why metal placed near the sea shore will easily have rust?the wind with moisture which contains salt solution,right? however ,i have a problem.When i put the metal in the test

    asked by Kong on November 8, 2011
  18. chemistry

    2.) If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are

    asked by xx on October 26, 2014
  19. chemistry(rusting)

    i know that metal placed in more acidic solution will produce rust faster.but why metal placed near the sea shore will easily have rust?the wind with moisture which contains salt solution,right? however ,i have a problem.When i put the metal in the test

    asked by Kong on November 8, 2011
  20. math

    I have to find an exact solutions on the interval [0,pi) for both of these problems-- 1) 2sin2x = sqrtx and 2) 1-2sqrt2 sinxcosx = 0 I know this much: 1) sin2x = (sqrt x)/2 = 2sinxcosx = (sqrt x)/2 What do I need to do next? 2) 1/(2 sqrt2) = sinxcosx =

    asked by kristie on August 1, 2006
  21. FINANCE

    4. Liquidity Premium Hypothesis Suppose we observe the following rates: 1R1 = 8 percent, 1R2 = 10 percent, and E(2r1) = 8 percent. If the liquidity premium theory of the term structure of interest rates holds, what is the liquidity premium for year 2, L2?

    asked by Anonymous on October 31, 2014
  22. Need help by tonite Finance

    4. Liquidity Premium Hypothesis Suppose we observe the following rates: 1R1 = 8 percent, 1R2 = 10 percent, and E(2r1) = 8 percent. If the liquidity premium theory of the term structure of interest rates holds, what is the liquidity premium for year 2, L2?

    asked by Anonymous on November 2, 2014
  23. Chemistry

    A solution of sodium chloride in water has a vapor pressure of 18.1 torr at 25°C. What is the mole fraction of NaCl solute particles in this solution? What would be the vapor pressure of this solution at 45°C? The vapor pressure of pure water is 23.8

    asked by Evelyn on January 13, 2019
  24. science

    during the experiment, the students were asked to prepare a 10% (mass/mass) solution of sugar in water . ramesh dissolved 10g of sugar in 100g of water while sarika prepared it by dissolved 10g of sugar in water 100g of the solution a) Are the two solution

    asked by irsha on September 6, 2011
  25. biology

    If I had an experiment where I was testing how the membrane permeability is affected by ethanol, and by doing this had to observe thin onion slides with different ethanol concentrations and had to count how many nuclei were seen through the microscope once

    asked by anonymous on January 31, 2012
  26. Math-acceleration

    An object moves across a straight line so that after t seconds, is distance from its starting point is: D(t)=t^3 - 12t^2 + 100t + 12 meters. Find the acceleration of the object after 3 seconds. I believe acceleration is calculated by taking the second

    asked by becky on October 3, 2006
  27. chemistry

    We add excess NaCl solution (58.44 g/mol) to 56 mL of a solution of silver nitrate (AgNO3 169.88 g/mol), to form insoluble solid AgCl. When it has been dried and weighed, the mass of AgCl (143.32 g/mol) is found to be 1.25 grams. What is the molarity of

    asked by cheri on September 19, 2012
  28. Chemistry

    1. A lab tech needs 1.00 L of 0.125 mol/L sulfuric acid solution for a quantitative analysis experiment. A commercial 5.00 mol/L sulfuric acid solution is available from a chemical supply company. Write out what steps he/she would follow to prepare the

    asked by AlphaPrimes on April 2, 2016
  29. Chemistry

    A sample of 0.314g of unknown monoprotic weak acid, HA was dissolved in 25.00 mL of water and titrated with 0.1M KOH. The acid required 27.20 mL of the base to reach equilibrium point. Find the pH of the solution if 40 mL KOH is added to the acid solution.

    asked by Lee on October 25, 2018
  30. quant chemistry

    A standard solution of Mn2+ was prepared by dissolving 0.250 g of Mn in 10 mL of concentrated HNO3 (measured with a graduated cylinder). The resulting solution was quantitatively transferred to a 100 mL volumetric flask and diluted to volume with distilled

    asked by John on February 12, 2016
  31. Business Communications

    When someone complains about a problem, is it a good idea to quickly suggest a solution? A. Yes, because a quick suggestion show you think quickly. B. Yes, because offering a solution shows that you care about the other person. C. No, because the other

    asked by Rain Misoa on August 18, 2010
  32. Chemistry

    1000 g of a 50% (mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution. How many liters of water should be added to the starting solution? Please show me the detail answer

    asked by Dewa on October 29, 2011
  33. Chemistry

    1000 g of a 50% (mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution. How many liters of water should be added to the starting solution? Please show me the detail answer

    asked by Dewa on October 29, 2011
  34. Adv. Alg. w/Trig.

    I need help writing equations for these two word problems: 1. On June 30th, Mr. Hester will be given $1,000,000 and in July, Mr. hester will be paid $100,000 per day. 2. On June 30th, we will set up an account for Mr. Hester starting with $0.05. Every day

    asked by Courtney on May 28, 2007
  35. chemistry

    A compound was found to be composed of the following amounts of elements: 20.00% wt% C, 26.64wt% O, 46.65 wt%N, and 6.71wt%H. A 6.125 grams sample of this compound dissolved in 46.205 grams of water as a solution was found to have a freezing point of

    asked by lucy on April 25, 2013
  36. Chemistry

    the lead (II) nitrate in 25.49 ml of a 0.1338M solution reacts with all of the aluminum sulfate in 25.00 ml solution. What is the molar concentration of the aluminum sulfate in the original aluminum sulfate solution?

    asked by CL on February 22, 2017
  37. math

    Solve the system by graphing. Then classify the system.? 6x-y=50 6x+7y=-14 What is the solution of the system? (type an ordered pair. Type N if there is no solution. Type R if the solution is all real numbers)

    asked by micheal on June 16, 2009
  38. Chemistry

    a solution of HCL is approximately 0.1M and has to be standardized . 1.234g Na2CO3 are dissolved to make 100ml of solution. 20mL of this solution are titrated with the HCL solution, requiring 31.3mL for the second equivalence point. what is the exact

    asked by Joshua on January 14, 2015
  39. chem

    which is the correct balanced equation for a given titration process, (a) or (b)? a) 6H+ + 2MnO4- + 3H2O2 -> 4O2 + 2Mn2+ + 6H2O b) 6H+ + 2MnO4- + 5H2O2 -> 5O2 + 2Mn2+ + 8H2O Process: Make a solution in a 100mL volumetric flask using 1g of NaBO3*4H2O, 20mL

    asked by sarah on March 30, 2011
  40. Stats

    On Tuesday September 27, 2016 the high temperature increased to 36.7 degrees Celsius (98 degrees Fahrenheit). What is the probability that we observe a temperature of 36.7 degrees Celsius or higher given that the average temperature is 27 degrees Celsius

    asked by Kleena on October 8, 2016
  41. Math

    1) Find the solution to the following system of two linear equations, if it has a solution. 2x-y=3, -x+y=1 2Find the solution to the following system of two linear equations, if it has a solution. 2x+y=4, x+3/2y=3

    asked by Megan on October 13, 2011
  42. algebra

    a chemist needs to mix a 70 alcohol solution with a 40 alcohol solution to obtain 75 liters of a 50% alcohol solution. how many liters of each alcohol solution must be used

    asked by Anonymous on April 17, 2019
  43. algebra

    1. Tell whether the system has one solution infinitely many solutions or no solution. 6y=-5x+24 2.5x+3y=12 a. one solution b. infinitely many solutions*** c. no solution i know its B but can you solve it step by step for me thank you

    asked by Leslie on December 12, 2016
  44. Organic Chemistry

    How am I supposed to do these questions? I'm completely lost. A 0.120 M solution of an enantiomerically pure chiral compound D has an observed rotation of 0.12° in a 1-dm sample container. The molar mass of the compound is 130.0 g/mol. (b) What is the

    asked by Jeff on November 8, 2015
  45. Biology-plz helppp

    Mendels Law of independent assortment says that inheritance of one trait is not influenced by inheritance of another trait. Using what you know about meiosis , explain how you can observe the law of independent assortment in action.

    asked by jackson on December 8, 2017
  46. chemistry

    there are 2 reactants copper(II) oxide and hydrochloric acid the products are copper(II)chloride and water. what change will you observe in the copper(II)oxide? was there a change in solubility? where is the copper(II)chloride? how can you tell

    asked by dianne on October 10, 2011
  47. chemistry

    According to Raoult's law, which statement is false? a. The vapor pressure of a solvent over a solution decreases as its mole fraction increases. b. The solubility of a gas increases as the temperature decreases. c. The vapor pressure of a solvent over a

    asked by thanh on March 14, 2008
  48. Chemistry

    What is the effect on the boiling point of a solution (for example, water) produced by a soluble nonvolatile substance (for example, sodium chloride)? What is the effect of an insoluble substance such as sand or charcoal? I believe if an insoluble

    asked by Phil on November 10, 2008
  49. chemistry

    Calculate the volume of 2,180 ppm Pb(NO3)2 solution required to prepare 1.2550 L of a 0.0021 M Pb2+ solution.

    asked by myles on February 15, 2012
  50. Chemistry-Please help

    Find the percent by mass of sodium chloride in a 1.45M NaCl solution. The density of the solution is 1.05g/mol .

    asked by Rose on October 5, 2009
  51. chemistry

    Calculate the molarity if a Ba(OH)2 solution if a 37.25ml portion of this solution is neutralized by 45.00mL of 1.500M HCl. You will need the balanced reaction

    asked by Anonymous on March 14, 2014
  52. Chemistry

    Which one of these properties is directly proportional to molality and why? A) Electrical conductance B) Heat of solution C) Equilibrium of solution D) Vapour pressure Thanks

    asked by MAD on July 3, 2017
  53. Chemistry II

    A solution is made by mixing 38.0 mL of ethanol, C2H6O, and 62.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?

    asked by Sam on July 17, 2012
  54. Chemistry

    Will the 90-100 mL of distilled water added to the acid solution (10.00 mL) significantly change the moles of H3O+ in the 1.00 M HCl solution? Why or why not?

    asked by Ash on October 5, 2013
  55. Chem 2

    A solution is made by mixing 47.0 mL of ethanol, C2H6O, and 53.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?

    asked by Pagye on July 14, 2012
  56. chemistry

    calculate the molarity of solution cacl2 . if on the chemical analysis . it is found that 200 ml of solution contains 3 into 10 raise the power 22 cl- ions

    asked by muskan on March 18, 2016
  57. chemistry

    A solution is made by dilution 400.mL of 2.0 M HCL to a final volume of 1000. mL. what is the pH of this solution? i'm stuck on this question i have no idea what to do, can anyone help? thanks:)

    asked by Miley on May 15, 2008
  58. chemistry

    what is the mass percent of an aqueous sodium hydroxide solution in which the molarity of NaOH is 4.37M? the density of the solution is 1.1655 g/mL.

    asked by Anonymous on April 22, 2014
  59. chemistry

    If 150.0 Ml of HCL solution are required to react completely with .35 moles of solid NaOH whats the molarity of the solution?

    asked by Aleander Azumah on October 12, 2009
  60. Chemistry

    Does the solid Zn(OH)2 dissolve when concentrated lye, NaOH solution, is added to a beaker containing a saturated solution of Zn (OH)2 and a small amount of Zn(OH)2?

    asked by Ron on May 5, 2010
  61. chemistry

    What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution?

    asked by smith on November 29, 2010
  62. URGENT CHEMISTRY

    A solution of hydrogen peroxide is 24.26% by mass and has a density of 1.11g/cm^3. the molarity of the solution? 7.54M .273M 8.03M 8.37M none of these

    asked by Cotton McKnight on March 9, 2011
  63. Chemistry

    A volume of 10.0 mL of a 0.00650 M solution of Cl- ions are reacted with 0.500 M solution of AgNO3. What is the maximum mass of AgCl that precipates?

    asked by Toni Jones on March 7, 2011
  64. chemistery

    A student dissolves 196 g of H3PO4 (Molar mass = 98 g) in enough water to make one liter of solution. The molarity of the solution is ?

    asked by ogb on December 9, 2012
  65. Chemistry

    25.0CM OF A DILUTE HYDROCHLORIC ACID SOLUTION WAS NEUTRALIZED BY 18.8CM OF A SOLUTION OF SODIUM HYDROXIDE WITH A CONCENTRATION OF 0.12CM

    asked by LAABES on November 11, 2018
  66. Basic Chemistry

    What is the molar concentration of Na+ in a solution prepared by dissolving 100.0g of Na3PO4 in sufficient H20 to form 2.00L of solution??

    asked by Steph on February 28, 2011
  67. General Chemistry

    Titration between iodine and thiosulphate. Why starch solution has to be added when the solution just turned pale yellow, but not at the beginning of reaction?

    asked by ConfuseChem on November 30, 2012
  68. chm

    An aqueous solution that is 30.0 percent sulfuric acid (H2SO4) by mass has a density of 1.105 g/mL. Determine the molarity of the solution.

    asked by victoria on February 2, 2015
  69. chemistry

    What is the molarity of a solution composed of 2.23 g of potassium iodide (KI) dissolved in enough water to make 0.181 L of solution? Answer in units of M

    asked by Roberta on February 25, 2014
  70. chemistry

    Calculate the concentration (% W/V) of NaCl solution that was made by dissolving 15.0 g of sodium chloride in enough water to make 300.0 mL of solution.

    asked by Chemistry Chick on October 29, 2011
  71. Chem7

    Calculate the osmotic pressure (in torr) of a solution containing 17.15 mg of hemoglobin (molar mass 6.5 x 104 g/mol) in 12.8 mL of solution at 25 degrees C.

    asked by Ryan on May 2, 2011
  72. chemistry

    you have 20ml of an aqueous solution of 0.2M NaOH. if you add distilled water to this solution until you have 200ml , what will be the concentration? How many times did you dilute it?

    asked by katlego on August 17, 2017
  73. Chemistry

    A student mixed 40ml of 0.2m Na2co3 solution with 50 ml f 0.25M cacl2 solution , what is the except number of moles of naclkkw that I will be formed ?

    asked by Mariam on April 20, 2014
  74. CHEMISTRY

    0.15g of hydrogen chloride (HCl) is dissolved in water to make 6.5L of solution. What is the pH of the resulting hydrochloric acid solution?

    asked by Anonymous on February 17, 2014
  75. Chemistry

    0.15g of hydrogen chloride HCl is dissolved in water to make 8.0L of solution. What is the pH of the resulting hydrochloric acid solution?

    asked by Jonah on March 1, 2013
  76. Chem 2

    What is the molarity of a solution composed of 8.210g of Potassium Chromate (K2CrO4),dissolved in enough water to make .500 L of solution

    asked by Cassidy on December 17, 2012
  77. Chemistry

    A 4.379 g sample of MgCl2 is dissolved in enough water to give 750.0 mL of solution. What is the chloride ion concentration in this solution?

    asked by Chris on April 14, 2014
  78. Chemistry

    If I leve 750 mL of 3.6 sodium chloride solution uncoverd and 150 mL of the solvent evaporates overnight, what is the new solution concentration?

    asked by Emma on February 20, 2014
  79. chemistry

    How many milliliters of a 15.0%, by mass solution of KOH(aq) ( d= 1.14g/mL ) are required to produce 27.0 L of a solution with pH = 11.70? I'm really not sure how to do this, it's from Acids & Bases chapter. Any help is appreciated, thanks. (:

    asked by Agatha on February 22, 2009
  80. chemistry

    A solution is made by dissolving 0.10 mole of Na2SO4 in water to a final volume of 1.00 L. What is the molar concentration of Na+ ions in the solution?

    asked by Dolores Ramirez on April 5, 2013
  81. AP CHEMISTRY

    Calculate [OH-] and pH for the following strong base solution; a solution formed by mixing 10.0 mL of 0.011 M Ba(OH)2 with 28.0 mL of 7.4 10-3 M NaOH working and answer would be appreciated

    asked by MARY on February 18, 2012
  82. Chemistry

    What will be the concentration if 52 milliters of a solution that is 12 parts per million in sodium chloride is diluted with enough water to make 97 millilters of solution?

    asked by Whitney on February 14, 2012
  83. chemistry

    A 4.691 g sample of MgCl2 is dissolved in enough water to give 750. mL of solution. What is the magnesium ion concentration in this solution?

    asked by nalleli on October 4, 2010
  84. Chemistry

    KClO3 dissociated in H20 should form a neutral solution. The results proved to be a slightly acidic solution with a pH of 6. What happened?

    asked by Misha on March 2, 2013
  85. chemistry

    What is the osmotic pressure in torr of a 0.0155 M glucose solution at body temperature ( 35.7 °C)? What are the boiling and freezing points for the same solution?

    asked by Ali on April 22, 2013
  86. CHEM 1411

    What volume (in mL) OF 0.0215M HBr solution is be required to titrate 0.235L of a 0.0150M Ca(OH)2 solution? Ca(OH)2+2HBr= CaBr2+2H2O

    asked by JACI WINLOW on October 18, 2016
  87. Chemistry

    when dissolved in an aqeous solution, which of the following salts will yield an acidic solution? NH4Cl, NaClO4, Na2S, MgBr2, Ba(CH3CO2)2

    asked by james on March 22, 2010
  88. Chemistry

    You have 475 mL of an 0.47 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.00?

    asked by Mark on January 19, 2013
  89. Chemistry

    How many milliliters of 0.540 M sodium sulfate solution would be needed to precipitate the calcium ion from 60.0 mL of 0.180 M CaCl2 solution?

    asked by Anonymous on November 8, 2016
  90. chemistry

    Calculate the molarity of a sodium hydroxide solution if 10.42 mL of this solution are needed to neutralize 25.00 mL of 0.2043 M oxalic acid. how do you do the working out

    asked by Anonymous on July 18, 2013
  91. chemistry

    When excess solid Mg(OH)2 is shaken with 1.00 L of 1.2 M NH4Cl solution, the resulting saturated solution has pH = 9.30. Calculate the Ksp of Mg(OH)2 I am not sure where to even begin on this problem.

    asked by Raj on March 21, 2010
  92. chemistry

    I asked this before, but got no response. A) If you make up a solution of 250 mL of 0.1 M TRIS in the acid form, what will be the pH? B) If you add 2 mL of 1 M NaOH to the solution in part A, what will be the pH? Thanks.

    asked by student on February 3, 2008
  93. Chemistry

    What is the morality of a solution prepared by dissolving 10.60g of sodium trioxocarbonate (v) in enough distilled water to obtain 250.0 ml of a solution?

    asked by Charles on November 21, 2016
  94. chemistry

    A solution of Na2CO3 is added dropwise to a solution that contains 1.34×10−2M Fe^2+ and 1.33×10−2M Cd^2+ . What CO3^2- concentration of is need to initiate precipitation? Neglect any volume changes during the addition.

    asked by CHEMISTRY on March 14, 2009
  95. chemistry HELP!

    Solve an equilibrium problem (using an ICE table) to calculate the pH of each solution: a solution that is 0.170 M in HC2H3O2 and 0.105 M in KC2H3O2

    asked by Lisa on December 15, 2010
  96. Chem 121

    A solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 260.0 mL. What is the molarity of the solution?

    asked by Barbara on July 26, 2011
  97. Chem

    What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution?

    asked by Brittany on January 27, 2011
  98. Chemistry 1200

    For each of these solutions, determine the boiling point of the solution 0.238 M glucose (C6H12O6) in water (Assume the density of the solution is 1.00 g/mL.)

    asked by Rukky on January 25, 2011
  99. Intermediate Algebra

    Solve using the elimination method.Show work.If system has no solution state this or infinite solution 8x+10y=-34 16x-5y=-43

    asked by sherry on March 27, 2012
  100. chemistry

    What is the molarity of the solution produced when 14.1 grams of ammonia is dissolved in sufficient water to prepare .100 liters of solution?

    asked by Drew on May 22, 2012