Question

Which of the following reagents will be used to test the solubility of precipitate formed when $AgN{O}_3$ solution is added to $HCl$?

• A. $HN{O}_3$
• B. $N{H}_{4}OH$
• C. $N{H}_{4}Cl$
• D. $H_{2}S{O}_4$

Answer 1

Answer: (B)

$N{H}_{4}OH$

In reaction of AgNO${}_3$ with HCl we get AgCl.

AgNO${}_3$ +HCl $\to$ AgCl $\downarrow$ +HNO${}_3$

AgCl on reaction with NH${}_4$OH gives Ag(NH${}_3{)}_2$ and Cl${}^{-}$. So, NH${}_4$OH is the only solution in above mentioned option is is the one that dissolve AgCl.

AgCl +2NH${}_4$OH $\to$ Ah(NH${}_3{)}_2^{+}C{l}^{-}$ +2H${}_2$O