Which causes a largest change in pH on addition to 20ml 0.1 M acetic acid solution ?

Options

A. Additon of 20 mol of 0.01 `MCH_(3)COOH`
B. Additon of 20 mL of 0.1 HCl
C. Additoin of 20 Ml of 0.1 M HCl
D. Additon of 20 mL of 0.1 M NaOH

Answer

D

Explanation

Moles of AcOH `=20 xx 10^(-3) xx 0.1 =2 xx 10^(-3)`
Moles of NaOH `=20 xx 10^(-3) xx 0.1 =2 xx 10^(-3)`
pH will change from acidic side to basic.