1. chemistry

    what is the concentration of a 250 ml solution that contains 44 grams of magnesium fluoride

    asked by Emily on August 21, 2013
  2. Math

    write three fractions that can be written as percents between 50% and 75%. Justify your solution.

    asked by Jen on November 13, 2014
  3. analytical chemisty

    Calculate the pH and pOH of a 0.00002M solution of acetic acid.

    asked by mary on September 23, 2012
  4. Chmistry

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    asked by Fofo on February 6, 2016
  5. Chemistry

    In a 0.05M solution of a weak monoprotic acid,[H+]=.0018.What is its Ka?

    asked by Danny on April 27, 2012
  6. Further Maths

    Find the values of N for which the solution of the equations 3x+2y=Nx and 15x+4y=Nx is not unique

    asked by Adam on October 10, 2010
  7. Chemistry

    Describe the creation of 234 mL of a 3.2 M sodium chloride solution

    asked by D on December 2, 2013
  8. Chemistry

    Calculate the volume of 0.3MHCL used to neutralise NaOH solution

    asked by Chris on March 25, 2013
  9. Chemistry

    A solution containing 42 of per 100.0 of water is cooled from 60 to 0 . What will happen during cooling?

    asked by Johannie on September 20, 2010
  10. Chemistry

    Calculate the concentrations of H3O+ and OH- ions in a 0.25 M HClO4 solution.

    asked by John on March 10, 2011
  11. chemistry

    If 27.3 g of NaNO3 are needed, what volume of a 5.78 % w/v solution will provide this mass?

    asked by lisa on April 26, 2012
  12. Chemistry

    Calculate the molarity of a 100. mL solution containing 22.3 g of sucrose (C12H22O11)

    asked by Mariah on September 24, 2012
  13. science

    what is the solute and solvent in a solution made from 15 mL of oxygen and 5 mL of helium?

    asked by jan on November 4, 2010
  14. please help analytical chemistry

    what is the activity coefficient of SO4^2- when the ionic strength of a solution is .1?

    asked by holly on March 9, 2013
  15. Chemistry

    What is the mass of glucose required to prepare 500ml of 1M solution

    asked by Merin rose on August 5, 2018
  16. ap calculus

    find the particular solution y=f(x) to the differential equation with the initial condition y(-1)=3/2

    asked by blake on April 28, 2012
  17. Chemistry

    How many moles of electrons are required to produce 23.8 g Cu from a CuSO4 solution?

    asked by Angel on May 2, 2010
  18. Chemistry

    when 5.00 g of CaCl2 dissolves in 50.0g of water, what is the boiling point of the solution

    asked by Leah on April 17, 2011
  19. CHM

    Calculate the solubility of Cu(oh)2 in grams per liters of solution if Ksp for Cu(OH)2 IS 4.8X 10^-20

    asked by ami on June 27, 2010
  20. chemistry

    Write ksp for ba3(po4)2 in an aqueous solution

    asked by Tina on April 30, 2012
  21. science

    determine the molar concentration of Ca^2+ and Cl- in a .075 M CaCl2 solution

    asked by abby on March 9, 2011
  22. chemistry

    will SrSO4 precipitate when .1g of Na2SO4 are added to 1L of a .01M solution of Sr

    asked by brittney on March 21, 2012
  23. Science

    Determine the molar concentration of Ca^2+ and Cl- in a .075 M CaCl2 solution

    asked by Moses on March 9, 2011
  24. Algebra 2

    Could you explain the difference between the solution(s)to an equation and the solutions to an inequality.

    asked by JOY on September 3, 2011
  25. chemistry

    What is the %v/v concentration of a solution made by adding 25 ml of acetone to 75 ml of water?

    asked by william on July 22, 2018
  26. chemistry

    The poH of a solution of 0.25mol/dm3 of Hcl acid is

    asked by peter onoriode on March 10, 2011
  27. mathematics

    if [x] denotes the integral part of x, then what is the solution set of the equation [x]^2 -5[x]+6=0

    asked by edward on September 22, 2012
  28. chemistry

    The mixture of 40 ml of water to 160 ml of solution with ph = 8, causes a change in the ph value. What is the value of the new PH. Use Log 2 = 0.3

    asked by kelly on July 30, 2018
  29. chemistry

    what mass of water is necessary to prepare 150.0g of 1.30% saline solution

    asked by Anonymous on December 12, 2014
  30. chemistry

    what is the molarity of a solution when you ha 2mole of ammonium chloride (AgNo3) in 1L?

    asked by Kim on January 26, 2011
  31. math

    Find values of x and y, if any, that will make the matrices equal. [ x y ] = [ 3 5 ] 1 9 1 9 a. x=-3,y=-5 b. x=5,y=3 c. x=-3,y=5 d. x=3,y=5 e. no solution

    asked by laura on August 26, 2016
  32. chemistry

    1L soulution has a pH of 6 how many OH- would it tak eto make it a pH7 solution?

    asked by ad on September 21, 2010
  33. chemestry

    if you dissolve 350 g of K(2)CrO(4)in 2.4 kg of water, what is the molality of the solution?

    asked by crystal on April 25, 2013
  34. chemistry

    How many ML of H2SO4 (20m) are needed to make 500ml of 5M solution?

    asked by ad on September 21, 2010
  35. CHEMISTRY

    CONC.OF NO2^-AND H3O^+IN A SOLUTION IN WHICH 4.5% OH HNO2 WAS IONIZED

    asked by JOSEPH on October 20, 2017
  36. algebra

    simplify the following radical expression: 3 sqrt (-27) a) 0 b) -3 c) 3 d) no solution exists

    asked by ami on June 21, 2010
  37. Chemistry

    What is the pH of a solution of 40.0 ml of 0.800 M HCl titrated with 4.00 ml of 1.00 M Hydroxyl amine?

    asked by Sara on April 24, 2013
  38. Chemistry

    Determine the mass of iron in the following solution. 325mL of FeSO4.

    asked by please help me out on November 11, 2016
  39. chemistry

    Calculate the pH of a solution prepared by mixing 25.0 mL of 0.60 M HC2H3O2 and 15.0 mL of 0.60 M NaC2H3O2?

    asked by Julie on May 6, 2010
  40. Chemistry stoichiometry

    How many grs of H2SO4 is required to obtain 0.1 molal of 1 kg solution?

    asked by Anonymous on August 10, 2017
  41. Physical Science

    Milk is an example of a A.solution B.homogenous mixture C.colloid D.compound I think its a??

    asked by Chickenbreath on August 28, 2018
  42. chemistry

    Calculate the pH of a solution prepared by mixing 25.0 mL of 0.60 M HC2H3O2 and 15.0 mL of 0.60 M NaOH?

    asked by Julie on May 6, 2010
  43. Chemistry

    a 0.20 mol/l solution of weak base hpo4 has a ph of 9. find the Kb

    asked by Dawn on June 1, 2016
  44. Chemistry

    Find the concentrations of all species in a 0.10mol/l solution of NaOH

    asked by Buck on May 31, 2016
  45. Alg 1

    Reasoning: The equation 3x^2 + bx + 3 = 0 has one real solution. What must be true about b? I think it is: b must be the same as -4(a)(c). What are your thoughts?

    asked by Jane on April 15, 2013
  46. math

    Which is the value is in the solution set for the inequality -8-7x>6 A=-1 b=-2 c=-3 d=2 -8-7x>6 add 8 to each side -7x>14 -7/-7>14/-7 x

    asked by b6 on January 3, 2013
  47. math

    write an integer for each solution a salary increase of $250

    asked by Alex on September 9, 2013
  48. chemistry

    Calculate the pH of the solution made by dissolving 8.00 g of lactic acid.

    asked by Jay on June 22, 2010
  49. Chemistry HELP URGENT PLEASE!!!

    what current (in amperes) is required to plate out 2.85 g of Cr from a Cr^3+ solution in a period of 2.50 hr?

    asked by Maho on March 17, 2014
  50. Algebra 1A

    When graphing the inequalities 9x+8y

    asked by Kim on July 3, 2013
  51. Chemistry

    Calculate the concentration of the hydronium ion([H3Ol+]) for a solution with the pH = 4.5

    asked by Lisa on March 25, 2012
  52. chemistry

    What is the final volume V2 in milliliters when 0.600 L of a 40.9 % (m/v) solution is diluted to 20.1 % (m/v)?

    asked by Anonymous on April 25, 2012
  53. Chemistry

    What is the possible ionic equation of TrisEDTA solution? REDOX reaction.

    asked by Maryam on April 25, 2012
  54. Math

    Let f(x) = 2x-1 and g(x) = 4-x. Find all values of x for which f(x) < -1 or g(x)

    asked by Peter on September 26, 2012
  55. chemistry

    how many moles of Cl- ion in the solution containing 0.187g Cl- dissolved in 50.0 ml water.

    asked by mel on October 23, 2007
  56. Chemistry

    the ka value of 0.001moldm-3 solution of a weak acid is 1.6*10-6 calculate the ph and the pka

    asked by Archie on February 9, 2016
  57. acid and base titrations

    what is the pH of a solution prepared by adding 0.50 mol KOH to 1.0 L of 0.30 M HNO3?

    asked by jj reddick on November 21, 2010
  58. chemistry

    What mass of HCL is contained in 645 mL of 0.266 M solution?

    asked by bob on May 28, 2009
  59. Maths

    How can it be possible for a set of inhomogeneous simultaneous equations to have no unique solution?

    asked by Alice on April 28, 2009
  60. Chemistry

    Why is it important to swirl the NaOH solution each time before using it during a titration?

    asked by K on March 26, 2011
  61. Algebra

    Determine the largest integer value of xxx in the solution of the following inequality. −4x−5>-4

    asked by PLZ on October 5, 2018
  62. chemistry

    how many kg of h20 must be added to 75.5g of Ca(NO3)2 to form a 0.500 m solution?

    asked by lynda smith on November 18, 2009
  63. chemistry

    Under what conditions might a chemist describe a solution in terms of molality? Why??

    asked by lola on May 25, 2010
  64. chemistry

    To 100 mL of a 0.1M NH3(Kb=1.8*10-5)solution,200mL of a 0.1M NaOH have been obtained.

    asked by Anonymous on July 5, 2016
  65. Calculus

    Find the complete solution to the 2nd ODE: 2y''+3y'+y=t^(2)+3sin(t)

    asked by Sara on July 18, 2013
  66. Chemistry

    (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid?

    asked by Anonymous on January 16, 2013
  67. CHEM 102

    What is the pH of a solution that is 0.62M H2SO4(aq) and 1.7M HCOOH (formic acid).

    asked by Calvin on October 3, 2011
  68. Chemistry

    (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid?

    asked by Anonymous on January 16, 2013
  69. College Algebra

    4y-3

    asked by LeAnn/Please help me on November 18, 2009
  70. science

    How many moles of li2so4 is required to prepare 300ml of a 0.5 m solution

    asked by ernstcia on March 31, 2015
  71. Chemistry

    (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid?

    asked by Anonymous on January 16, 2013
  72. Chemistry

    How many moles of KBr are present in 120mL of a 0.290M solution?

    asked by Chris on October 15, 2012
  73. Pre Algebra

    What is the solution to -55+q=7? P.S if you happen to Have any more answers to the other questions that is greatly appreciated

    asked by Help? on September 12, 2017
  74. chemisty 2

    Calculate the molarity (M) of a solution if you have 0.34 mol of NaOH in 19 ml of water

    asked by chris on October 23, 2012
  75. chemistry

    The ionization constant of HA is 1 × 10−6 . What must be the ratio of [A−] to [HA] for the preparation of a buffer solution with a pH of 6.49?

    asked by Avery on March 7, 2016
  76. chem

    How many chloride ions are present in 65.5 mL of 0.210 M AlCl3 solution

    asked by Anonymous on February 11, 2015
  77. Inorganic chemistry

    What change in coulombs, is required to deposit 0.301 g Cu(s) from a solution of Cu^2+(aq)

    asked by Steve on April 11, 2009
  78. Social studies

    who advocated for the solution of medicine and health in the progressive era?

    asked by Anonymous on September 25, 2017
  79. chemistry

    25 mL 0.4 M KOH will neutralize 10 mL 1.0 M H2SO4 solution. A) True B) False

    asked by ashley on March 27, 2015
  80. Math

    find missing coordinate of ordered pair so that it is solution 9x+4y-4=0

    asked by Felicia on June 29, 2016
  81. Chem

    how to prepare a 250 mL solution of .15 M K2SO4 with a volumetric flask

    asked by B on January 15, 2013
  82. Math

    How do I writ a equation that involves multiplication,contains a variable and has a solution of 5. Can you please help me

    asked by Nadia on November 29, 2016
  83. chemistry

    a 0,25M solution of a week acid is 3% dissociated.calculate ka

    asked by racha on April 4, 2012
  84. chemistry

    what is the molarity of a solution, if 12.0 g of KCl is dissolved into 500mL of H20

    asked by Anonymous on May 25, 2010
  85. Chemistry

    What is the kb of a 0.0200 m ( at equilibrium) solution of methyl amine, ch3nh2, that has a ph of 11.40?

    asked by Dylan on July 2, 2016
  86. College Algebra

    4y-3

    asked by LeAnn on November 18, 2009
  87. chemistry

    why should you be care when you heat your NacL solution to evaporate the water?

    asked by Anonymous on June 1, 2010
  88. Chemistry

    Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.03? The Ksp of Fe(OH)2 is 4.87×10-17 M3.

    asked by Jematormal91 on April 5, 2012
  89. Chemistry

    A 0.10M solution of a certain monoprotic weak acid has a pH of 2.44. Calculate Ka.

    asked by Jackson on March 1, 2016
  90. Chemistry

    Calculate the concentration of aqueous solution of barium hydroxide whose pH is 12

    asked by Momito on April 7, 2012
  91. Biochemistry

    Can anyone help?? What are the Concentrations of the various ionic species of a 0.1 M solution of lysine at pH4?

    asked by Emily on September 7, 2007
  92. Algebra

    I posted this before but could not understand the answer. How do I write the solution set of: {x| } for (x+20)(x -10)(x+11)>0

    asked by Daniel on May 30, 2010
  93. Chemistry

    Calculate the concentration of aqueous solution of barium hydroxide whose pH is 12

    asked by Momito on April 7, 2012
  94. chemistry

    What mass percent of a solution with 28.5 g of H2O2 and 300.0 mL of water?

    asked by Anonymous on March 23, 2011
  95. science

    what is molality of solution . in which Nacl and H2o have equal moles.

    asked by shubham on May 30, 2010
  96. Chemistry(Please help)

    What is the pH of 0.144M aqueous solution of ammonium nitrate? I am not sure what to do. Would I do 10^-0.144^ = 0.71?

    asked by Hannah on April 7, 2012
  97. CHEMISTRY

    I TOOK 510 ML ETHYLENE GLYCOLE & 60 ML H2SO4 WHAT COLOR SOLUTION I GOT?

    asked by VIRENDRA on September 30, 2011
  98. math

    which of the ff. coordinates of points belong to the solution set of the inequality y

    asked by =) on July 27, 2014
  99. Calculus-HELP PLZ !!!!

    Find the complete general solution to the 2nd ODE: 9y'' + 9y' - 4y = 0

    asked by Elyse on July 22, 2013
  100. precalculus

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    asked by Sara on January 13, 2012

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