Chemistry

posted by .

A 23.0mL sample of a diprotic acid is titrated with 0.260M KOH. If 55.5mL of base is required to reach the second equivalence point, what is the concentration of the acid? I'm not sure how to do this.

  • Chemistry -

    H2A + KOH ==> KHA + H2O
    KHA + KOH ==> K2A + H2O

    If 55.5 mL KOH were required to titrate to the second equivalence, then 55.5/2 mL were required to reach the first equivalence point.
    (55.5/2)*0.260 = ?? mmoles KOH.
    mmoles H2A = the same.

    M H2A = mmoles/mL
    You know mmoles H2A and mL H2A, solve for M

  • Chemistry -

    7.2

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    A 40.00 mL sample of 0.1 M NH3 is titrated with 0.150 M HCl solution. Kb = 1.8 * 10^-5 What volume of base is required to reach the equivalence point?
  2. chemistry

    A 20ml sample of .125M diprotic acid solution was titrated with .1019M KOH.the constants for the acid are k1=5.2*10 ^-5 and K2=3.4*10 ^-10. What added volume of base does each equivalence point occur?
  3. chemistry

    a 30.0ml sample of diprotic acid is titrated with .260M KOH. if 68.5ml is required to reach the equivalence point, what is the concentration of the acid?
  4. AP Chemistry

    18.0 ml of 0.122 M diprotic acid was titrated with 0.1017 M NaOH. The acid ionization constants for the acid are Ka1 = 5.2*10^-5 and ka2 = 3.4*10^-10. At what added volume of base does the first equivalence point occur?
  5. Chemistry

    Amino acid solution was made by taking 3.58 g of the dry amino acid and making it up to 1.00L in water. A 25.0 mL sample was taken and titrated with NaOH of concentration of 0.0493M, with the first equivalence point at 18.15 mL and …
  6. Chemistry Lab

    A 15.00 mL sample of a weak acid with Ka = 3.52x10-4, was titrated with 0.475 M KOH. The equivalence point was reached after addition of 19.5 mL of KOH with the phenolphthalein indicator. Determine the molar concentration of the original …
  7. Chemistry

    When a diprotic acid, H2A, is titrated by NaOH, the protons on the diprotic acid are generally removed one at a time, resulting in a pH curve that has the following generic shape. (a) Notice that the plot has essentially two titration …
  8. Chemistry

    A 17.6ml sample of a monoprotic acid is titrated with 0.212M NaOH. If 69.2ml of base is required to reach the equivalence point, what is the concentration of the acid?
  9. chemistry

    A 30 mL sample of .165 M propanoic acid is titrated with .300M KOH. Calculate the pH at each volume of added base: 0 mL, 5 mL, 10, equivalence point, one-half equivalence point, 20 mL, 25 mL. Use calculations to make a sketch of the …
  10. Physical Chemistry

    If 20.0mL of 0.122M NaOH are required to reach the first equivalent point of a solution of citric acid(tripotic acid H3C6H5O7).How many mL of NaOH in total are required to reach the second equivalence point?

More Similar Questions