Question

$A$ is an aqueous solution of acid and $B$ is an aqueous base. If they are diluted separately, then:

• A. $pH$ of $A$ increases and $pH$ of $B$ decreases
• B. $pH$ of $A$ deceases and $pH$ of $B$ decreases till $pH$ in each case is $7$.
• C. $pH$ of $A$ and $B$ increase.
• D. $pH$ of $B$ and $A$ decreases

Answer 1

Answer: (A)

$pH$ of $A$ increases and $pH$ of $B$ decreases

Dilution simply consists in adding water in an aqueous solution. It makes increase the proportion of solvent compared to that of the solute. In diluting an acidic solution the solution becomes less acidic,its pH increases and approaches 7 and dilution of of basic solution becomes less basic,its pH decreases and approaches 7. The solution becomes neutral in nature.