You are given 60 mL of .50 M acetic acid/acetate buffer to test. The starting co

Question

You are given 60 mL of .50 M acetic acid/acetate buffer to test. The starting composition of the two major species are:

CH3COOH: 0.304 M--------CH3COO: 0.196 M

a. use the henderson-hasselbach equation to estimate the initial pH of the buffer.

b. You add 1 mL of 1 M HCl to the buffer. Calculate the molarity of H30+ added as HCl, and the final molarities of acetic acid and acetate ion at equilibrium. What is the new value of pH?

C. Now take a fresh 60 mL of the buffer and add 1 mL of 1 M NaOH. Using steps similar to those above, calculate the new pH of the solution.

Explanation / Answer

pH = pKa + log(A-/HA) = -log(1.70x10^-4) + log(0.49/0.30)
pH = 3.77 + 0.21 = 3.98 (4.0; 2 s.f.)

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.