Chemistry

posted by .

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.240 M HClO(aq) with 0.240 M KOH(aq). The ionization constant for HClO can be found here.

  • Chemistry -

    Divide the titration curve into 4 parts.
    a. beginning
    b. between beginning and eq pt.
    c. eq pt
    d. after eq pt.

    First, determine mL to eq pt.
    mLacid x M aci = mL base x M base and that determination tells you how to divide into the four part.
    a.......... HClO ==> H^+ + ClO^-
    I..........0.240M.....0.....0
    C............-x.......x......x
    E.........0.240-x.....x......x

    Substitute the E line into the Ka expression for HClO and solve for x = (H^+), then convert to pH.

    b. mmols to start = mL x M = 50*0.240 = about 12.
    mmols KOH added. You don't give a value but lets say 25 mL. So 25 x 0.240 = about 6. Therefore, you have 6 acid left and you formed 6 of the salt from
    .......HClO + KOH ==> KClO + H2O
    I.......12.....0........0......0
    add............6.............
    C.......-6.....-6........6......6
    E........6.......0.......6.......6

    Use the Henderson-Hasselbalch equation to solve for the pH.
    pH = pKa for HClO + log (6/6)
    ?

    c. The pH is determined by the hydrolysis of the salt.
    ........ClO^- + HOH ==>HClO + OH^-
    I......0.12............0......0
    C........-x............x......x
    E........-0.12-x........x.....x

    Kb for ClO^- = (Kw/Ka for HClO) = (x*x)/(0.12-x).
    Substitute and solve for x = OH^- and convert to pH.
    NOTE: The concn of the salt at the eq.pt is just 1/2 of 0.240. Since they are the same molarity you have added 50 mL KOH so the M salt is just 1/2 of what acid or base started.

    d. After the eq. pt is just excess KOH.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.230 M HClO (aq) with 0.230 M KOH (aq). The ionization constant (Ka) for HClO is 4.00 x 10^-8. (b) after addition of 25.0 mL of KOH (d) after addition …
  2. chem

    Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.150 M HClO(aq) with 0.150 M KOH(aq). The ionization constant for HClO is 4.0*10^-8 a)before addition of any KOH b)after addition of 25.0 mL of KOH c)after …
  3. Chemistry

    Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.200 M HClO(aq) with 0.200 M KOH(aq). The ionization constant for HClO can be found here. A. Before any addition of KOH B. After addition of 25.0 mL of …
  4. Chemistry

    Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq).HClO is a weak acid with a Ka of 4.0× 10–8. It reacts with strong base to produce ClO–. (e) after addition of …
  5. Chem

    A 20.00−mL sample of an unknown HClO 4 solution requires titration with 22.92mL of 0.2200M NaOH to reach the equivalence point. What is the concentration of the unknown HClO 4 solution?
  6. chemistry

    A solution of HClO is mixed and found to have a pH of 4.53. Find what the initial concentration of HClO was for this solution. Ka = 3.00 × 10−8 for HClO. Answer in units of mol/L please help this is due in 1 hour
  7. chemistry

    Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.150 M HClO(aq) with 0.150 M KOH(aq). The ionization constant for HClO is 4.0x10^-8. pH before the addition of any KOH?
  8. college general chemistry 2

    a chemist titrates 70 ml of .7889M HClO solution with .6221M KOH. calculate pH at equivalence. pKa of HClO is 7.50 I am getting pH of 17.72 Is that right?
  9. Chemistry

    You have 1.0 liter of .45 M HCLO (aq). At 25 degrees Celsius, Ka= 3.5x10^8 for this acid. Calculate the pH of .45 M HCLO and the concentration of CLO- at equilibrium. Thank you very much for any amount of help you are willing to give …
  10. Chemistry

    The Ka of HClO is 3.0x 10^-8 at 25°c. What is the percent ionization of HClO in a 0.015M aqueous solution of HCLO at 25°c?

More Similar Questions