Chemistry 2

calculate the PH of a mixture containing 30 mL, 0.10M HC2H3O2? (Ka=1.8x10^-8 of HC2H3O2)

  1. 👍 0
  2. 👎 0
  3. 👁 76
  1. If this is a mixture you didn't post all of the problem.

    1. 👍 0
    2. 👎 0
  2. yeah i forgot to put
    + 30 mL, 0.10 M of NaOH

    1. 👍 0
    2. 👎 0
    posted by Cris H.
  3. You also listed Ka wrong. That's 1.8E-5.
    acetic acid is HAc = HC2H3O2
    millimols HAc = mL x M = 30 x 0.1 = 3
    millimols NaOH = 3

    ........HAc + NaOH ==> NaAc + H2O
    I.......3.......0........0.....0
    add.............3.............
    C......-3......-3........3......3
    E.......0.......0........3......3
    So you have at equilibrium a solution of sodium acetate, NaAc, and the molarity is 3 millimols/60 mL = 0.05M
    The acetate ion hydrolyzes in water as follows:
    ..........Ac^- + HOH ==> HAc + OH^-
    I.......0.05..............0.....0
    C.........-x..............x.....x
    E......0.05-x.............x.....x

    Kb for Ac^- = (Kw/Ka for HAc) = (x)(x)/(0.05-x)
    Solve for x = (OH-) and convert to pH.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Hi Dr. Bob, this is a chemistry question. I don't know how to go about solving this problem: What is the pH of the solution created by combining 11.40 mL of the 0.10 M NaOH(aq)with 8.00 mL of the 0.10 M HC2H3O2(aq)? Here's what I

    asked by Yo on October 28, 2009
  2. Chemistry -- to Dr.Bob

    I posted this yesterday and tried to work it out today but i don't remember how to. You said convert to moles by multiplying for example .1M x .008L= 8x10^-4 ...after this what do i do with this number to find the pH i tried to

    asked by Amy on May 2, 2008
  3. Chemistry

    A buffer solution contains 0.052 M HC2H3O2 and 0.025 M NaC2H3O2. The pH of this solution is _____. Ka for HC2H3O2 is 1.8x10-5.

    asked by Morgan on December 1, 2015
  4. Chemistry

    At 20 degrees celsius ,if the equation is C7H6O3(s)+C4H6O3(l)=C9H8O4+HC2H3O2(l), then how many liters of acetic acid, HC2H3O2 , would be formed if the density of HC2H3O2 is 1.05 g/ml?

    asked by Rene' on February 6, 2012
  5. chemistry

    What is the pH of the solution created by combining 2.40 mL of the 0.10 M NaOH(aq) with with 8.00 mL of the 0.10 M HC2H3O2(aq)? So, here's my working so far: .00024 mol NaOH .0008 mol HC2H3O2 .0008 - .00024 = .00056 mol HC2H3O2

    asked by Brandon on May 4, 2009
  6. chemistry

    the Ka for acetic acid, HC2H3O2, is 1.8x10-5 at 25 deg. Celsius. In a .10 M solution of potassium acetate, which of the following are true? I. [HC2H3O2] = [OH-] II. [H+] = [OH-] III. [C2H3O2-] < .10 M a. I only b. II only c. III

    asked by Anonymous on April 22, 2007
  7. Chemistry

    If 25mL of 2.00M NAOH is added tpo 50mL of 0.10M HC2H3O2 (Ka=1.8*10^-5), what is the pH? moles HC2H3O2= c*v = .1 * .05L = .005 moles NaOH= c*v = .2 * .025L = .005 pH= Pka + log (B/A) = 4.75 + log (.005/.005) = 4.75 I'm not sure

    asked by Sara on August 10, 2009
  8. chemistry

    What is the pH of the solution created by combining 2.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL of NaOH pH w/HCl pH w/HC2H3O2 2.80 ? ? okay, so i tried m1v1=m2v2

    asked by UN on July 9, 2008
  9. Chemistry

    Calculate the theoretical pH after 2.50 mL and 9.50 mL of NaOH has been added in both the titration of HCl and of HC2H3O2. Given: Molarity of all chemicals are 0.1 M HCl and HC2H3O2 are 8ml prepared in 100ml water.

    asked by Raskin on May 10, 2012
  10. Chemistry

    A solution buffered at a pH of 5.00 is needed in an experiment. Can we use acetic acid and sodium acetate to make it? If so, how many moles of NaC2H3O2 must be added to a 1.0L of a solution that contains 1.0 mol HC2H3O2 to prepare

    asked by Veronica on June 20, 2014

More Similar Questions