Chemistry

Determine the pH of a .50 M solution of H2S04 and also determine the concentration of the sulfate ion (SO42-)

  1. 👍 0
  2. 👎 0
  3. 👁 39
asked by Hoot
  1. I don't know where you are in chemistry but this problem is not as easy as it looks. The problem is that H2SO4 is a strong acid (100% ionized) for the first H^+ BUT the second one is not completely ionized (k2 = 1.2E-2). As a result, the first H that comes off reduces the ionization of the second one even further so the pH is essentially determined by the first ionization. ]
    H2SO4 ==> H^+ + HSO4^-
    HSO4^- ==> H^+ + SO4^2-
    k2 = 0.012 = (H^+)(SO4^2-)/(HSO4^-)
    So you set up an ICE chart for k1 and k2.
    ..............H2SO4 ==> H^+ + HSO4^-
    initial.......0.5M0......0......0
    equilibrium.....0.......0.50....0.50*see below.

    ..............HSO4^- ==> H^+ + SO4^2-
    initial......0.50.......0.......0
    change.........-x.......x.......x
    equil........0.50-x......x.......x

    k2 = 0.012 = (H^+)(SO4^2-)/(HSO4^-)
    Now substitute.
    (H^+) 0.50 from first equn + x from second.
    (SO4^2-) = x from second equn
    (HSO4^-) = 0.50-x frm second equn.
    0.012 = (0.50+x)(x)/(0.5-x) and solve for x. You will need to solve the quadratic OR you can do it by successive approximations.
    The (H^+) then is 0.5+x and x is the sulfate.

    1. 👍 0
    2. 👎 0
  2. In the above I used k1 after saying H2SO4 had no k1. It doesn't. I should have said the first ionization which I referred to k1.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Consider a solution containing 4.35 mM of an analyte, X, and 1.09 mM of a standard, S. Upon chromatographic separation of the solution peak areas for X and S are 3251 and 10075, respectively. Determine the response factor for X

    asked by ScienceGeek on June 7, 2013
  2. Chemistry

    1)Write the general equation used to determine the volume of stock required to make a given concentration of standard? Define any terms you used. ----use the 100ml flasks to create four serial dilutions of the stock 10,000uM

    asked by josh on April 23, 2010
  3. chemistry Thank a lot help

    100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final density 1.25g/ml. 50ml of 20.8% bacl2 and 100ml of 9.8% h2s04 solution are mixed.

    asked by Ken on November 22, 2014
  4. chemistry

    A bottle of commercial hydrochloric acid solution So is labeled 37% composition by mass, density 1.19 kg/L. Calculate the concentration of solution So. 4.2 ml of So are diluted to 500ml solution called S. We titrate S with 200 ml

    asked by angy on December 7, 2016
  5. chem, grade 12

    I'm having a hard time with this... ...I need help. I want to learn... Question 1) The electrolyte from a car battery has H2S04 (aq) concentration of 4.5 per mol and a density of 1.18g per mol. What is the percentage by mass of

    asked by atriletz on January 27, 2007
  6. chemistry

    100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final density is 1.25g/ml 50ml of 20.8% bacl2 and 100ml of 9.8% h2s04 solutions are mixed.

    asked by Ken on November 16, 2014
  7. Organic Chemistry 1

    Consider the HF solution with the concentration of 5%(w/v). You can convert the % concentration into the molarity. a) Assume that you have 100ml of this solution. Determine the number of moles of HF if the concentration of HF is

    asked by Zaza to DrBodd22 on October 27, 2016
  8. Chemistry

    calculate the concentrations of H2S04, H30+, HSO4- and SO42- in 0.4 M H2S04 solution

    asked by Johnny on November 27, 2016
  9. Chemistry

    I am really having a hard time doing this question. We were asked to determine the iron content of spinach in a solution. We burned a 5.50g of spinach and added 10 ml of 2.0 M HCl in the spinach ashes. We mixed that and filtered

    asked by Shia on November 13, 2016
  10. Chem (edited)

    The electrolyte from a car battery has H2S04 (aq) concentration of 4.5 per mol per litre and a density of 1.18g per ml What is the percentage by mass of H2S04 in the electrolyte? do you mean 4.5 mol per liter? This has absolutely

    asked by atriletz on January 27, 2007

More Similar Questions