Chemistry

posted by .

A solution is prepared by dissolving 50.0 g of pure HC2H3O2 and 20.0 g of NaC2H3O2 in 975 mL of solution (the final volume).

what is the ph?

What would the pH of the solution be if 50.0 mL of 0.900 M NaOH were added?

What would the pH be if 30.0 mL of 0.30 M HCl were added to the original 975 mL of buffer solution?

Please help I have tried using the Henderson Hasselbach equation and I am not getting the correct answer.

  • Chemistry -

    Show your work and I'll guide you through it.
    First, just the pH of the solution.

  • Chemistry -

    I multiplied 50g by 975 mL and then 20g by 975 mL. Then I used the given pKa of 4.745 + log (19,500 / 48,750) = 4.35

  • Chemistry -

    Thos are molarities that go in the HH equation.
    mols HAc = 50/molar mass HAc
    M HAc = mols/0.975L = ?

    mols NaAc = 20/molar mass NaAc.
    M NaAc = mols/0.975
    pH = pKa + log b/a
    I get close to 4.2 but that approximate.
    By the way you can take a shortcut and use mols base/mols acid and obtain the same answer as if you used M base/M acid. That's because the 975 mL cancels.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    1) How many drops of 12M HCl would you add to 1.00 L of 0.100 M HC2H3O2 to make [C2H3O2-] = 1.0 x 10^-4 M?
  2. Chemistry

    a solution is made by combining 5 mL of .2M HC2H3O2, 5 mL of .2M NaC2H3O2, and 10 ml of water. calculate the molarity of HC2H3O2 and of NaC2H3O2 in this new solution
  3. chemistry

    A solution is prepared by dissolving 0.5842g of oxalic acid (H2C2O4) in enough water to make 100.0ml of solution. A 10.00ml aliquot (portion) of this solution is then diluted to a final volume of 250.0ml. What is the final molarity …
  4. chemistry! URGENT

    A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 10.0 mg of fluoxymestrone in enough water to give a total volume of 500.0 ml. A …
  5. Chemistry

    A buffer solution is prepared by adding 14.37g of NaC2H3O2 and 16.00g of acetic acid to enough water to make 500mL of solution. What is the initial concentration of C2H3O2 in the solution?
  6. chemistry

    A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 13.4 mg of fluoxymesterone in enough water to give a total volume of 500.0 mL. A …
  7. Chemistry

    A solution is prepared by dissolving 25.0 g of pure HC2H3O2 and 25.0 g of NaC2H3O2 in 700 mL of solution (the final volume). (a) What is the pH of the solution?
  8. chem

    A solution is prepared by dissolving 15.0 g of pure HC2H3O2 and 15.0 g of NaC2H3O2 in 600 mL of solution (the final volume). What is the pH of the solution?
  9. Chemistry

    A solution is prepared by dissolving of pure HC2H3O2 and of NaC2H3O2 in of solution (the final volume). (a) What is the pH of the solution?
  10. Chemistry

    A solution that is prepared by mixing 20.0 mL of 0.32 M HC2H3O2 with 20.0 mL of 0.36 M NaC2H3O2 would have a pH of ___. For HC2H3O2, Ka = 1.8 x 10-5.

More Similar Questions