Question

The $pH$ of a solution containing $100mg$ of sodium hydroxide in $250mL$ of water is

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

Answer 1

Answer: (A)

Molarity of solution
$=\frac{100\times 10^{-3}\times 1000}{40\times 250}$
$=0.01M$
$pOH=-log[10^{-2}]=2$
$\therefore pH=14-2=12$