What is the pH of 0.00l moldm³ solution of sodium hydroxide

A. 14
B. 13
C. 12
D. 11

Correct Answer:

Option D – 11

Explanation

[H+][OH−] = 10 − 4
[H+] =10 − 14 ÷ [OH+]
=10 −14 ÷ (1 × 10 − 3) = 10 − 11
pH = − log10[H+ ]
= − log10[10 − 11] = − 1 × −11
log10[10 − 11] = 1
= − 1 × 11 × 1
= − 11