posted by .

Oxalic acid, found in the leaves of rhubarb and other plants, is a diprotic acid.

H2C2O4 + H2O ↔ H3O+ + HC2O4-
Ka1= ?
HC2O4- + H2O ↔ H3O+ + C2O42-
Ka2 = ?

An aqueous solution that is 1.05 M H2C2O4 has pH = 0.67. The free oxalate ion concentration in this solution is [C2O42-] = 5.3 x 10-5 M. Determine Ka1 and Ka2 for oxalic acid.

  • Chemistry -

    ka1 = (H^+)(HC2O4^-)/(H2C2O4)
    ka2 = (H^+)(C2O4^2-)/(HC2O4^-)
    You get (H3O^+) from pH.
    You're given C2O4^2- and H2C2O4. Plug and chug.

  • Chemistry -

    Ka1= 0.6381
    Ka2= 5.565 x 10-5

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Oxalic acid is a relatively strong diprotic acid with Ka1 = 5.6 ´ 10-2 and Ka2 = 5.1 ´ 10-5. What is the oxalate ion, C2O42-, concentration in a 0.10 M oxalic acid solution?
  2. chem

    sorry . Can you please help me with this questions If you know?
  3. chemistry

    oxalic acid, h2c2o4, is a weak acid capable of providing two H3O+ ions. ka=.059 k2=6.4E-5 the [h3o]+ in a .38 M solution of h2c2o4 is .12M and can be calculated by the first ionization step only. what is the equilibrium concentration …
  4. chemistry

    Calculate the concentration of oxalate ion (C2O42−) in a 0.175 M solution of oxalic acid (C2H2O4). [For oxalic acid, Ka1 = 6.5 × 10−2, Ka2 = 6.1 × 10-5.]
  5. Chemistry(Please check)

    Which of the following equations correspond to the Ka2 for phosphoric acid?
  6. Chemistry

    What is the hydroxide ion concentration of a 0.370M oxalic acid, H2C2O4, solution?
  7. chemistry

    what is the hydronium ion concentration of a 0.35M oxalic acid, H2C2O4. solution?
  8. Chemistry

    1. Calculate the concentration of H3O+, HC2O4-1, and oxalate ion (C2O42-) in a 0.175 M solution of oxalic acid (C2H2O4). [For oxalic acid, Ka1 = 6.5 ´ 10-2, Ka2 = 6.1 ´ 10-5.]
  9. Chemistry

    How do you find the Ka1 and Ka2 of oxalic acid when it is in a solution that is 1.05 M H2C2O4 and has a pH of 0.67. [C2O4^2-] = 5.3x10^-5 M. I have tried using an ICE table for both reactions, as oxalic acid is a diprotic acid, but …
  10. AP Chem

    Write 2 complete Bronsted/Lowry acid/base reactions for the reaction between HC2c2O4- and HPO42-. Identify all conjugate pairs. my answers: HC2O4- + HPO42- -> H2C2O4 + PO43- HC2O4- and H2C2O4 are conjugate pairs HPO42- and PO43- …

More Similar Questions