If a buffer solution is 0.130 M 0.130 M in a weak acid (K a = 1.4 * 10 - 5) Ka=1.4*10-5) and 0.540 M 0.540 M in its conjugate base, what is the pH?

Question

Chemistry

Camille Francis

21 May, 02:45

If a buffer solution is 0.130 M 0.130 M in a weak acid (K a = 1.4 * 10 - 5) Ka=1.4*10-5) and 0.540 M 0.540 M in its conjugate base, what is the pH?

+4

Answers (1)

Know the Answer?

Judith Hebert · Answer 1

Answer: pH = 0.68015

Explanation:

From the question,

pKa = 1.5*10-5, [salt] = 0.54M, [ acid]=0.13M

Using the Henderson Hasselbalch equation

pH = pKa + log[salt/acid]

pH=1.4*10-4 + log[0.54/0.14]

pH = 0.000015 + 0.618

pH=0.68015