- #1

i_love_science

- 80

- 2

- Homework Statement
- (see below)

- Relevant Equations
- titration curve

pH + pOH = 14

at halfway point:

pH=pKa

pOH=pKb

What is true about the pK of the analyte?

a) pKa = 9.2

b) pKb = 9.2

c) pKb = 4.8

d) pKa = 11.7

The halfway point is at point 4, at approximately pH=9.2. Therefore, the pOH = pKb = 4.8, and I think the answer is c).

The solution says b) is the correct answer. Could anyone explain why, or whether or not my answer is correct? Thanks.