Question

Identify type of following buffer
a. CH₃COOH + CH₃COONa
b. Cu(OH)₂ +CuCl₂​

Answer 1

Answer:

For given buffer, pH=pK

a

+log

[CH

3

COOH]

[CH

3

COONa]

(I) Diluting will change the concentrations such that the ratio remains the same. Hence pH will not change.

(II) & (III) Adding some HCl or NaOH will change the concentration ratio, thus changing the pH.

(IV) Adding equal moles of CH

3

COONa & CH

3

COOH may change the ratio, thus changing the pH .