Question

$0.607$ g of silver salt of a tribasic acid on combustion gave $0.37$ g pure silver. Calculate the molecular weight of acid.

• A. $105.3$
• B. $110.6$
• C. $210.6$
• D. $220.12$

Answer 1

Answer: (C)

$210.6$

Eq wt of silver salt = Eq. wt of silver

$\frac{0.607}{E}=\frac{0.37}{108}$

$\therefore$ Eq.wt of silver salt = 177.2

$\therefore$ M.wt of silver salt (tribasic)= 177.2 *3 = 531.6

$\therefore$ M.wt of acid = 531.6 - 3 * At.wt of silver + 3* At.wt of H

= 531.6 -3 * 108 +3 * 1

= 210.6