Question

A precipitate of $AgCl$ is formed when equal volumes of the following are mixed. $[K_S\, for\, AgCl = 10^{-10}]$

• A. $10^{-4} M\,AgNO_3$ and $10^{-7} M\,HCl$
• B. $10^{-5} M\, AgNO_3$ and $10^{-6} M\, HCl$
• C. $10^{-5} M\, AgNO_3$ and $10^{-4} M HCl$
• D. $10^{-6} M\, AgNO_3$ and $10^{-6} M HCl$

Answer 1

Answer: (C)

A precipitate of $AgCl$ is formed when equal volumes of $10^{-5} M Ag NO _{3}$ and $10^{-5} M HCl$ are mixed, because ionic product will be $10^{-9}$ which is greater than $K_{s p}\left(10^{-10}\right) .$ For the precipitation of an electrolyte, it is necessary that the ionic product must exceed its solubility product.