1. chemistry

    why spectrophotometric bioassay indirectly determine the concentration of glucose in solution

    asked by amin on March 26, 2013
  2. science

    How much water should be added to 55.0 mL of 0.201 M HCl to dilute the solution to 0.155 M?

    asked by Lauren on April 18, 2011
  3. CHEMISTRY

    If 2.5 * 10^-2 g of Fe(NO3)3 added to 100mL of 1.0 * 10^-4 M NaOH solution , will it produce precipitate ? thank you

    asked by MAD on July 7, 2014
  4. AP Chemistry

    what is the pH of a solution that is 0.060 M in potassium propionate and 0.085 M in propioic acid

    asked by Steph on March 22, 2011
  5. chemistry

    How much concentrated 12 M hydrochloric acid is needed to prepare 100.0 mL of a 2.0 M solution?

    asked by {RayRay} NEED HELP PLZ on May 11, 2010
  6. chemistry

    Determine the hydronium and hydroxide ion concentrations in a solution that is 2.0 × 10-2 M NaOH

    asked by Chloe on October 9, 2018
  7. chemistry

    What is (a)PH(b) POH of a solution wholes hydrogen ion consentration is 5.00x10-4?

    asked by Anonymous on March 20, 2012
  8. computer science

    What are the Control Identifiers, Domain, in the Layered Security Solution Report?

    asked by Freeman on November 22, 2014
  9. chemistry

    Calculate the pH of a solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M benzoic acid (Ka = 6.5 x 10 -5

    asked by haley on March 15, 2011
  10. Science

    How much sugar must be added to 50ml of water to make a saturated solution at 0°

    asked by Miss K on May 7, 2019
  11. Chemistry

    3)How many grams of sodium chloride do you need to weigh out to prepare 1.4L of 0.9% NaCL solution?

    asked by Daniel on December 6, 2011
  12. Chemistry

    If you make a solution in the laboratory that contains 0.1 M hydrochloric acid, what concentration of hydronium will you have?

    asked by Rose on February 29, 2016
  13. chemistry

    Calculate the pH of a 0.800 M NaCH3CO2 solution. Ka for acetic acid, CH3CO2H, is

    asked by noel on January 16, 2011
  14. chemistry

    how many grams of calcium nitrate are needed to make 100mL of a 0.5M solution

    asked by Anonymous on March 14, 2011
  15. Chemistry

    How do you prepare 2% Cu S04? How does this solution differ from 2M CuS04? I am stumped. Thank you. Deb

    asked by Debbie on April 30, 2012
  16. maths

    find in implicit form, the general solution of the differential equation dy/dx = 2(e^x-e^-x)/y^2(e^x+e^-x)^4

    asked by grace on March 24, 2011
  17. Analytical Chemistry

    How many millimoles and molecules of solute are in 500 ml of a solution that is 5.41 ppm KMnO4?

    asked by Anna on April 18, 2012
  18. discrete math

    Find the solution to the following lhcc recurrence: an=3nan−1 for n2 with initial conditions a0=4.

    asked by cjones on April 20, 2012
  19. chemistry

    how do i write a procedure for making a 100mL of 0.5 M solution of sodium phosphate

    asked by krystal on May 8, 2010
  20. Discrete Math

    Determine How many integer solution there are to X1+X2+X3+x4=19 if A) 0 ¡Ü Xi for all 1 ¡Ü i ¡Ü 4 B) 0¡Ü Xi < 8 for all 1 ¡Ü i ¡Ü 4 C) 0¡ÜX1,¡Ü5,0¡ÜX2¡Ü6,3¡ÜX3¡Ü7,3¡ÜX4¡Ü8

    asked by chad on October 4, 2010
  21. ENGLISH

    in the modest proposal by Jonathon swift what is the actual solution he wants to implement

    asked by celi on January 3, 2011
  22. chemistry

    what is the concentration, in % m/m of a solution prepared from 50.0g sodium chloride and 150.0g of water

    asked by tim on April 5, 2011
  23. College algebra

    use interval notation to express the solution set of the inequality |2x + 3|> or equal to 9

    asked by Jess on February 1, 2012
  24. chemistry

    how many grams of NaOH would be needed to make 896mL of a 139 M solution

    asked by Randy on April 30, 2012
  25. Chemistry

    How much water must be added to 24.0 grams of salt ot make a solution that is 12.0% by mass?

    asked by Beth on April 9, 2011
  26. calc

    Which of the following is the general solution of the differential equation dy dx equals the quotient of 8 times x and y?

    asked by Anonymous on July 1, 2015
  27. geometry

    what is the solution to this problem? -2=2x^2-7x negative two equals two times "x" squared minus seven "x".

    asked by anonymous on September 22, 2008
  28. Chemistry

    Calculate the [H3O+] when 1.65 grams of KOH are dissolved in 500.0 mL of solution

    asked by Amrita on May 12, 2010
  29. Chemistry

    Molality of aqueous solution of urea is 4.What will be the mole fraction ofH2O?

    asked by Dipika Dang on March 29, 2015
  30. pre algebra

    which of the following is an example of an open equation? 5x + 7 = 12 12 + (-8) = 4 25 = 5(5) ********* 8+0=8 which of the following equations has a 3 as a solution -2b = 6 4a - 5 = 12 5y = y + 8 z - 15 = -12 ****** plz check my answers

    asked by Anonymous on October 12, 2018
  31. chemistry

    The pH of a solution prepared by mixing 45 mL of 0.183 M KOH and 65 mL of 0.145 M HCl is ?.

    asked by ben on November 23, 2010
  32. math

    For each of the following, identify the whole-number property being illustrated. (a) 2(3 + 4) = 2(4 + 3) (b) 5 + 7 = 7 + 5 (c) 1 • 14 = 14 = 14 • 1 (d) 5(9 + 3) = 5 • 9 + 5 • 3 (e) 2 + (3 + 2) = (2 + 3) + 2 (f) 5(3 • 4) = (5 • 3)4 are e, and f

    asked by Anonymous on September 24, 2010
  33. chemistry

    suppose 0.0139g of HNO3 is dissolved in 625 mL of aqueous solution. what is the pH

    asked by joseph on February 15, 2015
  34. Science

    How many millilitres of water must be added to 30 mL of 10 M of HNO3, so that the solution concentration is reduced to 0.2 M?

    asked by Tumpale on August 24, 2016
  35. chemistry

    Would a solution that contains a mixture of NCl and HCl be an effective buffer? Explain

    asked by chuma on March 24, 2011
  36. Chemistry

    A piece of cadmium is placed in a solution in which [Cd^2+]=[Sn^2+]=1.00M. Will the following reaction proceed spontaneously? Cd(s)+Sn^2+(aq)-->Cd^2+(aq)+Sn(s)

    asked by Amanda on November 9, 2010
  37. Chemistry

    Calculate the solubility of silver chloride in a solution that is .170M in NH3

    asked by Gabby on March 30, 2015
  38. college chemistry

    What is the pH of the solution obtained by diluting 500 mL of 0.0200 M NH3 (aq) to 1.000 L ?

    asked by shanice on November 9, 2010
  39. Chemistry

    What is the concentration of a solution which contains 1 mole of CaCl2 dissolved in 2000mL of solutions?

    asked by KT on June 1, 2010
  40. chemistry

    if you react magnesium solution and lead powder together is there a temperature change?

    asked by Beth on January 9, 2011
  41. chemistry

    *.How many grams of KCl would you need to add to 2 liters of water to make a .50 M solution?

    asked by tApAsh on June 21, 2015
  42. math

    which value is a solution of the equation 2-8x=-6 Plz answer and give whole test answers

    asked by brandon on September 20, 2018
  43. chemistry

    The ionic strength of an aqueous solution containing 0.24 M CH3COOAg and 0.050 M NH4Cl is:

    asked by RC on August 12, 2013
  44. Algebra II

    Identify the graph of the solution set of 8.5>6.1 +0.6y. Would the answer be all numbers 4 and greater? Thanks.

    asked by Lucy on October 18, 2007
  45. Chemistry

    How many moles of Io3 are present in a 100mL solution containing 1.390g of KIO3

    asked by Chris on September 28, 2011
  46. Chemistry

    how to prepare 100 mL of exactly 5.00% (w/w) aqueous hydrogen solution? If given that initial it is 50.0% (w/w) and has density of 1.18 g mL^-1

    asked by Balnur on March 30, 2011
  47. chemistry .............chemistry

    what color emission would you see if you heated each solution to an extremely high temperature? why

    asked by Maria on October 12, 2012
  48. physics

    What is the concentration (in g/100ml ) of a solution which has 2,8g of NaCI dissolved into 88.0ml of water?

    asked by keria on January 20, 2012
  49. chemessty

    What is the freezing point of an aqueous solution of 10.0 g of glucose (C6H12O6) in 50.0g H2O? (kf=-1.86 C/m)

    asked by bill on March 16, 2011
  50. Chemistry

    You are to prepare a KH2PO4 and Na2HPO4 solution with pH=7.31. What should the concentration of [2(HPO4) 2-] / [H2PO4-]

    asked by Pepz on March 16, 2013
  51. Chemistry

    What is the pH of a solution in which 25 mL of .10 M NaOH is added to 15 mL of .10 M HCl? I have calculated the amount of moles of each, but I'm not really sure where to go from there. Thanks!

    asked by Hannah on April 11, 2010
  52. chemistry

    What is the molarity of the Cl- ion in the solution of a sample containing 0.187g Cl- dissolved in 50.0 ml water?

    asked by mel on October 23, 2007
  53. chemistry

    What is the concentration (in % mass) of a solution in which you dissolve 200 mg of NaHCO3 in 1.0 L of water?

    asked by Kiley on May 4, 2010
  54. Math

    I have my answers can you check them for me pls. 1. Which of the following ordered pairs is a solution of the equation y = -4x^2? (-2,16) (1,-8) (0,-4) (2,-16)***

    asked by Help me pls on November 7, 2018
  55. chemistry

    Please explain me which solution reacts faster to breakdown the materials the 25% or 10% HCL?

    asked by Jack on September 25, 2011
  56. Chem

    Which of the following is weak electrolyte in solution -H2S -H2SO4 -HI - HNO3 - HCI

    asked by Taylor on October 24, 2007
  57. Chemistry

    Calculate the solubility of silver chloride in a solution that is 0.140 M in NH3.

    asked by Jack on April 5, 2009
  58. Cemistry

    Why do we have to heat KMnO4 solution when we have to do the titration with the oxalate ions for such reaction?

    asked by Tukana on May 18, 2010
  59. Chemistry

    Describe how you would prepare 2.00 L of an aqueous solution having a pH=3.60, if you had a supply of 0.100 M HCl available.

    asked by Beth on April 12, 2012
  60. chemistry

    Calculate the grams of solute needed to prepare each of the following. 55.0 ml of a 6.50 hcl solution.

    asked by mary on November 2, 2012
  61. Math

    Does the equation square root of x^2 + 3X= x-3 have no solution because I think there isn't one? change it to x^2 +2x +3=0 Now factor.

    asked by Kellie on January 16, 2007
  62. Computer science

    Working solution for specimen paper 2015 9608 for task 2

    asked by Anita on November 8, 2016
  63. Chemistry 2

    Which solution will have the lowest pH ? A. .10 M HCN B. .10 M HNO3 C. .10 M NaCL D. .10 M H2CO3 E. .10 M NaOH

    asked by Sammie on September 22, 2010
  64. college chemistry

    Which of the following would make the best buffer solution and explain. HF and NaF or NaC2H3O2 and CH3COOH

    asked by Mic on November 20, 2010
  65. chemistry

    3. Find the molarity of a solution made from 734 g of Li2SO4 and 2.5 L of water

    asked by Sam on January 24, 2013
  66. Chemistry 1200

    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
  67. math intergers and algebraic exressions

    hi mrs sue how are you i need help with my math unit test i really need help what is the solution to -55+q=7 my answer is a

    asked by killer kev on September 29, 2017
  68. Science-Chemistry(mole concept)

    How many kg of wet NaOH containing 15% water are required to prepare 70 litre of 0.5N solution?

    asked by Giri on July 14, 2017
  69. Chemistry Redox Reaction

    Balance the equation as a redox reaction in acidic solution. Cu(s)+NO3^-1(aq)-->Cu^2+(aq)+NO(g)

    asked by Juggernaut on June 4, 2009
  70. science

    how can I prepare 5 micromolar solution of Fe(NO3)3.9H2O? plz guide me as soon as possible

    asked by Soumya on February 25, 2016
  71. chemistry

    what happen when a solution of NaoH is add in drop and then in excess to Cacl

    asked by kay on May 4, 2010
  72. Chemistry

    How would I calculate the mass of 20ml of a 3% hydrogen peroxide from a 30% H2O2 solution?

    asked by John on September 26, 2012
  73. chemistry

    How many grams of magnesium iodide are needed to make 125 ml of a 5M solution

    asked by John on March 31, 2011
  74. chemistry

    3. What volume of 0.18M Na2CO3 would neutralize 25ml of the HCL solution?

    asked by Katie Wilson on October 24, 2012
  75. Chemistry

    Determine the mass of iron in the following solution. 325mL of 0.050 M FeSO4.

    asked by please help me out i forgot to add something) on November 11, 2016
  76. Chemistry

    Calculate the pH of 0.0115M acetic acid solution at 25 degrees celcius with Ka=1.75*10^-5

    asked by Gift on September 23, 2011
  77. health and physical education

    an accident chain always contains the A.problem B.unsafe action c.solution or d.witnesses

    asked by ciara on May 15, 2015
  78. math

    Write an inequality that represents each situation. graph the solution. Help appreaciated Thanks. 4x + 6 ¡Ý 34.

    asked by dillon on October 23, 2007
  79. chemestry

    How many moles of zinc acetate, Zn(CH3COO)2, are there in 163 mL of a 0.160 M solution?

    asked by cristy on November 17, 2010
  80. chemistry

    the amount of K2Cr2O7 required to prepare 100ml of its 0.05N solution

    asked by saba anjum on April 25, 2013
  81. chemistry

    A solution is prepared by mixing 30,0g sucrose with 30,0g. what is a concentration expressed in ppm?

    asked by Mviti on May 29, 2019
  82. Math

    tell whether the given ordered pair is a solution of the equation y=9-2x;(-2,5) Help i kinda don't understand

    asked by Madison Kayla on October 23, 2017
  83. college chem 2

    What pressure would be required to form a 0.050 M solution of helium (kH = 3.7 x 10-4 M/atm) at 25 °C?

    asked by I have no idea what im doing on August 25, 2018
  84. Math

    why is it that in a linear inequality, each point on a dashed boundary line is not a solution?

    asked by Angie on April 6, 2009
  85. Math

    How much water in mL must be added to 40mL of a 10% acid solution to reduce its concentration to 4%?

    asked by Anonymous on June 24, 2016
  86. Chemestry

    When you were dissolving salt or sugar in a beaker of water, how did you know it was a saturated solution?

    asked by monique on February 10, 2016
  87. Chemistry

    I think that titrating NH3 with HCl solution has a neutral equivalence point where the pH = 7.0. Is this right?

    asked by Mary on May 5, 2010
  88. Chemistry

    How many seconds does it take to deposit 81.5 g of Zn on a steel gate when 21.0 A is passed through a ZnSO4 solution?

    asked by JIm on May 21, 2015
  89. chemistry

    what change occurs when sucrose solution is heated?Give evidence.

    asked by Sibgha on September 6, 2008
  90. college chemistry

    given 3.650 l of a 1.75 M solution, what mass of calcium chloride is needed to prepare?

    asked by Anonymous on September 22, 2010
  91. chemistry

    what are the products of a concentrated solution of magnesium chloride if the electrodes used are inert

    asked by Anonymous on June 1, 2016
  92. algebra

    write an inequality. graph the solution. a hamster weighs less than 10 ounces. thanks

    asked by dillon on October 23, 2007
  93. BUFFER

    What is the pH of a solution made by adding 50 mL 0.1 M HCl to 150 mL 0.099 M NH3?

    asked by Nicole on April 13, 2011
  94. Prcts chemistry

    Calculate the pH of 0.0115M acetic acid solution at 25 degrees celcius with Ka = 1.75*10^-5

    asked by Gift on September 22, 2011
  95. Calculus

    Find the particular solution that satisfies the intial condition: xdy - (2xe^(-y/x)+y)dx = 0

    asked by John on January 5, 2012
  96. chemistry

    Calculate the mass of copper (ii) sulphate which needs to be used to prepare 500cm³ of a 0.1M solution.

    asked by Livingstone on March 16, 2016
  97. Chemistry

    Determine the normality of 91.2 g of HCl in 4.3 L of solution. (Round to the nearest hundredth.)

    asked by Kailee on January 28, 2013
  98. CALC

    Find the particular solution of the given differential equation dydx=−4xe(y−x^2);y=11whenx=1. THanks

    asked by SARAH on June 21, 2016
  99. college

    How many milliliters of 0.100 M KOH would you need to titrate 25.0 mL of the oxalic acid solution

    asked by Polly on October 9, 2010
  100. trig

    Help find the general solution to:sin^2x-3cosx+sinxcosx-3sinx=0

    asked by Piwokazi on September 12, 2011

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