Question

A sample of NaOH weighing 0.4 g is added to 100 mL of a 0.1 N $H_{2}S{O}_4$ solution. The resultant solution becomes:

• A. Acidic
• B. Strongly acidic
• C. Alkaline
• D. Neutral

Answer 1

The correct option is D Neutral

Molar mass of NaOH = 40 g/mol.
When 0.4 g of NaOH is added to 100 mL,
Molarity of $NaOH=\frac{0.4}{40}\times \frac{1000}{100}$
= 0.1 M
Thus, normality of NaOH = 0.1 N (n-factor = 1)
Milliequivalents of $NaOH=0.1\times 100=10$
Milliequivalents of $H_{2}S{O}_4=0.1\times 100=10$
10 milliequivalents of acid will be neutralized by 10 milliequivalents of base.
Therefore, the solution will be neutral.