1. chemistry

    Calculate the ionization constant, Ka, of phenol (HC6H5O), a weak acid, if a 0.25 M solution of it has a pH of 5.24.

    asked by Audrey on November 15, 2010
  2. Chemistry

    how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?

    asked by Bobbi on March 3, 2011
  3. chemistry

    the solution contain 6 grams of caustic soda dissolved per dm.find the percentage impurity

    asked by ahmed on November 15, 2010
  4. chemistry

    how many grams of NaOH must be added to 0.250 litres of water to form a solution of PH=10.0?

    asked by joey on September 7, 2010
  5. value

    what happens when a solution of iron 2 sulphate in a test tube was bubbled through chlorine gas

    asked by value on September 24, 2016
  6. Chemistry

    need help balancing the following. redox reaction in acidic solution. Clo3-+Cl->>Cl2+ClO2

    asked by chuckles on December 2, 2012
  7. gpc

    Calculate the molarity of a bleach solution that is 8% by mass (m/v) or 8g/100mL sodium hypochlorite.

    asked by samry on March 3, 2014
  8. pre-calculus

    please help me with thisone thanks solve the inequality algebraically. Express the solution in interval notation. (x-8)^2/x^2-36 > 0

    asked by dave on March 1, 2011
  9. Chemistry

    if 25.0 mL of 15M nitric acid is diluted to 125 mL, what is the concentration of the new solution? i got 3M but i don't think its right

    asked by Anonymous on March 4, 2014
  10. math

    the function has a real zero in the given interval. approximate this solution correct to two decimal places. f(x)=x^4-x^3-7x^2+5x+10; (2,3)

    asked by fast80us on March 1, 2011
  11. Chemistry

    if 25.0 mL of 15M nitric acid is diluted to 125 mL, what is the concentration of the new solution? i got 3M but i don't think its right

    asked by Anonymous on March 4, 2014
  12. chemistry

    Battery acid is 4.27MH2SO4(AQ.) And density of 1.25g/ml . What is the molality of H2SO4 in the solution

    asked by anjali on May 3, 2015
  13. Chemistry

    What is the molarity of a solution that results when 3.64 g KCl is dissolved in water and diluted to exactly 200.0 mL?

    asked by Van on February 27, 2016
  14. chemistry

    If you begin with 0.030 L of a 2.5M NaOH solution, what concentration will you end up with if you dilute it to 0.050?

    asked by Anonymous on February 22, 2016
  15. science

    If 2.7 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

    asked by Andrea on April 18, 2013
  16. Algebra

    Solve by substitution method. 6x+9y=-12 -5x+y=27 What is the solution of the system? Type an ordered pair... Please help Thanks!

    asked by Sadie on May 5, 2009
  17. chemistry

    What is the concentraton of a solution made by dissolving 0.5 moles of solute in 9.0 liters of water?

    asked by Juliettte on March 5, 2011
  18. math

    What is the solution of 7 + m is greater than or equal to 2 and m + 1 is less than 2? Please explain or show how you got the answer-I'm having a really hard time

    asked by Julie Anne on September 7, 2010
  19. Math

    Help-I just started Algebra II and I'm lost. What is the solution of 10 = absolute value of 7-3x. Please show steps so I can understand

    asked by Joel on September 7, 2010
  20. Chemistry

    if 20.00 grams of NaOH are diluted in enough water to make 1.00 liter, what is the molarity of the solution?

    asked by Anonymous on December 5, 2012
  21. Math

    What is the solution of 7 + m is greater than or equal to 2 and m + 1 is less than 2? Please explain or show how you got the answer-I'm having a really hard time

    asked by Julie Anne on September 7, 2010
  22. Chemistry

    Determine how much of a 0.780M K2Cr2O7 solution is required to completely dissolve 4.70g of Cu

    asked by Maegan on December 5, 2012
  23. Chemistry

    What mass of sucrose, C12H22O11, is needed to make 500mL of a 0.20M solution? Help please... Thanks.

    asked by Lucy on November 18, 2007
  24. chemistry

    What is the molality of a solution which contains 20.0 g of cane sugar, C12H22O11 dissolved in125g of water?

    asked by george on April 15, 2013
  25. Density of a CUSO4 solution

    I need to determine the density of a CUSO4 solution of 1% concentration from a 10cc pipette volume.

    asked by Lorraine on March 6, 2011
  26. Algebra

    What is the solution of 7 + m is greater than or equal to 2 and m + 1 is less than 2? Please explain or show how you got the answer-I'm having a really hard time

    asked by JulieAnne on September 7, 2010
  27. Math

    2 liters of cleaning solution is 65% ammonia. How much water must be added to dilute it to a 40% soulition?

    asked by Ashley on September 29, 2016
  28. chemistry

    Determine the pH of a 0.045mol dm–3 solution of sodium ethanoate (ethanoic acid: pKa=4.75).

    asked by Kay-Anna on September 30, 2015
  29. chemistry

    what is the total molarity of all the ions present in 0.1M cuso4 and 0.1M al2(so4)3 solution?

    asked by banda on September 30, 2015
  30. Chemistry

    how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?

    asked by Bobbi on March 3, 2011
  31. Chemistry

    What is the molarity of a solution prepared by diluting 25.0 mL of 0.412 M magnesium nitrate to a volume of 1.50 L please help!

    asked by Ashley on November 30, 2012
  32. Calculus

    Find the particular solution of the differential equation y'=(5x+21y)/7x satisfying the initial condition y(1)=5.

    asked by Hannah on November 18, 2010
  33. science

    how many milliliters of 5.5M H2so4 must you use to prepare 500ml of 0.2M sulfuric acid solution? Please hurry!!!!!!

    asked by grant on December 14, 2012
  34. CHEM

    WHAT IS THE pH of 1.00 molar solution of NaNO3(aq)? The Ka for nitric acid is 0.0007.show all calculations

    asked by Zitha on March 12, 2011
  35. chemistry

    What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?

    asked by n/a on March 12, 2011
  36. science: chemistry

    How many moles of NaOH must be added to 1.0 L of 2.6 M HC3H5O3 to produce a solution buffered at each pH? 1)pH= 4.28 2)pH=pKa

    asked by Julie on July 23, 2015
  37. Chemistry

    What volume of 0.200 N H2SO4 is required to neutralize a solution containing 8.00 equivalents of NaOH?

    asked by Joe on November 10, 2010
  38. Chemistry

    What volume of 0.25 mol L-1 sodium nitrate solution could be prepared using 6.00 moles of compond?

    asked by Jacob Paul on November 27, 2012
  39. Chemistry

    Balance the following redox reaction in basic solution. H2(g)+Fe3+(aq) ---> H2O(l)+Fe2+(aq)

    asked by Anonymous on October 23, 2016
  40. Chem 2

    what mass of Iodine(I2) must be used to prepare a .960m solution if 1000g of ethanol (C2H5OH0 is used?

    asked by Cassidy on December 17, 2012
  41. College Chemistry Help Please!

    what is the pH of a solution that is 0.200 M in methylamine, CH3 NH2 CH3NH2+ H20 CH3NH3+ + OH- Kb= 4.2 x 10 ^-4

    asked by shanice on November 9, 2010
  42. chemistry

    In an electrolytic solution the density of CuSO4 decreases or increases or remains constant?

    asked by prashant on September 12, 2016
  43. Science

    Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?

    asked by Kamal on April 29, 2013
  44. Science

    Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?

    asked by Kamal on April 29, 2013
  45. Science

    Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?

    asked by Kamal on April 29, 2013
  46. Chemistry

    How would the freezing point of a solution change if the unknown had ionized or dissociated? Explain.

    asked by G on March 14, 2011
  47. chemistry

    how do i find the grams of potassium chloride per 100g of water in the saturated solution

    asked by sam on November 27, 2012
  48. Chemistry

    what is the mass percent of a solution made by dissolving 35.5 g. of NaCl in 500 g. of water?

    asked by Dillan on September 27, 2015
  49. chemistry

    calculate the mass of sodium hydroxide needed to prepare 500 mL of a 0.10 M solution.

    asked by Rebecca on October 14, 2007
  50. science

    23g of salt is dissolved in 100g of water at 23 k. what is the concentrarion of solution at this temperarure.

    asked by shehzad on October 3, 2015
  51. chemistry

    how many grams of NaCl (molecular weight 58.5) should be used to prepare 20 liters of a solution containing 154mEq/L?

    asked by mary on February 27, 2011
  52. Chemistry

    Balance the following equation for a basic solution. MnO4-+C2O4-2= Mno2 + CO3-2

    asked by Brittney on October 27, 2013
  53. College Chem

    How many mL of concentrated ammonia (14M) should be diluted to 250 mL to make a 0.75 M NH3 solution?

    asked by Lisa on November 19, 2010
  54. Analytical Chemistry

    How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

    asked by AREEJ on November 30, 2012
  55. Analytical Chemistry

    How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

    asked by AREEJ on November 30, 2012
  56. CHEMISTRY

    What mass of NaCl is required to precipitate all the Ag ions from 20 mL of .100 M AgNO3 solution

    asked by CIndy on April 22, 2013
  57. algebra ll

    Show the work to solve |2x+5| -1 < 6 and describe the graph of the solution in a complete sentence.

    asked by justina on August 30, 2011
  58. Inorganic Chemistry

    What is the mole fraction of solute in a 1.00 molal solution in which toluene (C7C8) is the solvent.

    asked by Cris on October 16, 2016
  59. economics

    Why would assigning property rights be a solution to pollution caused by burning coal?

    asked by autumn on December 6, 2007
  60. science

    How much sugar must be added to 50g of water to make a saturated solution at 0 degrees?!

    asked by Danielle on November 29, 2012
  61. math

    If 6 is added to the numerator and denominator of the fraction 7/9,what will be the value increase or decrease ?by how much ?i need solution answer

    asked by sheirra on September 17, 2016
  62. science

    Calculate the amount of h2so4 required for preparing 500ml of 2MH2so4 solution.

    asked by v¨ªşhął on February 29, 2016
  63. chemistry

    How many grams of na3po4 will be needed to produce 425ml of a solution that has a concentration of na+ ions of 1.30 M?

    asked by James on September 11, 2010
  64. Chemistry

    Calculate volume of 6MHCL required to prepare a 250 ml of a 0.15MHCL solution??

    asked by Karen on April 9, 2013
  65. chemistry

    What is the concentration when 60.0 mL of a 9.00 M HCl solution is diluted to 1.170 liters? and how do you solve this problem?

    asked by katie on April 4, 2013
  66. Science

    Determine the pH of a 0.62M NH4NO3 solution at 25oC. The Kb for NH3 is 1.76x10-5. Calculate Ka

    asked by Manushi on December 28, 2016
  67. Chemistry

    What mass of NaOH is required to prepare 500.0 mL of 0.1029 M stock solution?

    asked by Erin on October 9, 2012
  68. Chemistry

    what is the percent by mass of a solution by dissolving 200 g of NaCI in 500 mL of water?

    asked by Annyssa on June 15, 2016
  69. chemistry

    calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution

    asked by mike on October 7, 2012
  70. chemistry

    calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution

    asked by mike on October 7, 2012
  71. Chemistry

    What is the pH of a solution obtained by adding 15 g deK2SO4em 150 ml NaHSO4 with Molarity of 0, 2 m. HSO4 Ka = 1, 3.10^-2

    asked by Arya on March 26, 2016
  72. chemistry

    The bottle of hydrogen peroxide from the store says it is a 3% solution by mass. What is its molal concentration?

    asked by billy bob j on April 17, 2008
  73. chem 2

    What concentration of NaF is required in order to convert a 0.15M HF solution to a buffer with a pH of 5.50?

    asked by emily on December 5, 2010
  74. Chemistry

    The solution "head" dissolves in the water and the mixing "tail" dissolves in the oil. or The mixing "head" dissolves in the water and the solution "tail" dissolves in the oil. which one is right? thank you for your time!

    asked by Baby on April 17, 2008
  75. chemistry

    what is the balanced equation for potassium iodide and solid zinc in an acidic solution

    asked by Anonymous on June 21, 2010
  76. Chemistry

    Calculate the pH and the pOH of an aqueous solution that is 0.025 M in HCl(aq) and 0.075 M in HBr(aq) at 25°C.

    asked by Alex on October 6, 2012
  77. molarity

    what mass of sodium hydroxide, NaOH, must be dissolved to make 460 ml of a 1.10 M solution

    asked by erica on February 27, 2008
  78. chemistry

    What is the volume in liters of a 0.760M K3PO4 solution containing 220.9g of potassium phosphate?

    asked by Chris on February 7, 2013
  79. Pre-Calculus

    Find the unknown in the following equation. If there are more than one solution, then separate the solutions with a comma. (−8y−4)^2+10=14 y=? I keep on getting y=-0.5, is that correct?

    asked by Ann on October 6, 2013
  80. algibra

    In two or more complete sentences, describe how you would draw the graph of the solution set for the following inequality. -3m+18 < 30

    asked by myndie on January 23, 2017
  81. Chemistry

    What is the osmotic pressure in atmospheres of 40.00% ( m/v) NaCl solution at a temperature of 0.0 degrees celcius

    asked by Ruffles on December 4, 2013
  82. Chemistry lab

    What mass of NaOH is required to prepare 500.0 mL of 0.1029 M stock solution?

    asked by Donnie on October 9, 2012
  83. chemistry

    Consider two beakers, one with water and other one with sodium chloride solution. Which of these will have higher vapor pressure

    asked by Angel on June 20, 2010
  84. chemistry

    How many grams of calcium nitrate, Ca(NO3)2, are needed to make 100 mL of a .5 M solution?

    asked by Anonymous on October 24, 2010
  85. chemistry

    how many mL of the above 5.00% solution are needed to make 100 mL of physiologic saline (.90 sodium chloride)?

    asked by Anonymous on October 24, 2010
  86. General Chemistry

    How many milliliters of 0.5M NaOH must be added to 200 mL of 0.1M NaH2PO4 to make a buffer solution with a pH of 6.9?

    asked by Joanna on January 31, 2013
  87. chemistry

    What would be made if hydrogen sulphide gas was bubbled through a solution of zinc nitrate

    asked by kennedy on January 4, 2017
  88. chem

    A solution that is formed by combining 600. mL of 0.20 M NaOH with 400. mL of 0.40 M HNO3 has an H+ concentration of

    asked by leona on June 19, 2010
  89. Chemistry

    Calculate the mass of HF required to prepare 200 mL of 0.25 mol/L solution. P = 40%; d = 1.14 g/cm3

    asked by Jacke on June 21, 2016
  90. Chemistry

    Suppose you are given a sample of a homogeneous liquid. What would you do to determine whether it is a solution or a pure substance?

    asked by Shannon on August 15, 2010
  91. Chemistry

    The pH of a 0.0050 M aqueous solution of calcium hydroxide is? Make sure to include all equations.

    asked by Student on December 3, 2010
  92. Chemistry

    What is the osmotic pressure in atmospheres of a 15% sucrose solution at a temperature of 25 degrees celcius

    asked by Ruffles on December 4, 2013
  93. Chemistry

    What volume of 0.159 M Na3PO4 solution is necessary to completely react with 92.6 mL of 0.119 M CuCl2?

    asked by Anonymous on October 21, 2015
  94. chem

    What mass of KCl (MM = 74.55 g/mol) is required to make 600 mL of a 0.175 M solution

    asked by whitney on April 12, 2011
  95. biology 110

    using a spectrophotometer what is the relationship between absorbance and the concentration of light absoring substance in a solution.

    asked by kim on February 23, 2008
  96. math

    What are the steps to the solution for this problem? What is the difference between 330 and half n equals 114?

    asked by Sandra on April 13, 2011
  97. Chemistry

    What is the osmotic pressure in atmospheres of a 15%(m/v) sucrose solution at a temperature of 25 degrees celcius

    asked by Ruffles on December 4, 2013
  98. chemistry

    How many grams of rubidium chloride are present in 125.0 mL of a 1.75M RbCl solution?

    asked by Chris on February 7, 2013
  99. Chemistry

    In a titration of 35.00 mL of 0.737 M S, __________ mL of a 0.827 M KOH solution is required for neutralization.

    asked by Charlie on October 5, 2012
  100. pre-calculus

    solve for the follow inequality. write your solution in interval notation. x^3-49x¡Ü0

    asked by ladybug on September 30, 2012