Question

0.126 g of an acid is needed to completely neutralize 20 ml 0.1 (N) NaOH solution. The equivalent weight of the acid is:

• A. 53
• B. 40
• C. 45
• D. 63

Answer 1

Answer: (D)

63

Number of equivalents of acid = number of equivalents of base

$=\frac{N\times V}{1000}$

$=\frac{0.1\times 20}{1000}$

$=2\times {10}^{-3}$

$2\times {10}^{-3}$ equivalents have mass = 0.126 g

1 equivalents has mass $=\frac{0.126}{2\times {10}^{-3}}g=63g$