Question

The $pH$ of a solution is $6.$ Sufficient amount of acid is added to decrease the $pH$ to 2 . The increase in hydrogen ion concentration is

• A. three times
• B. hundred times
• C. thousand times
• D. ten thousand times.

Answer 1

Answer: (D)

pH =6 means $\left[H^{+}\right]=10^{-6},pH=2$means $[H^{+}]=10^{-2}M$

Hence increase in $H^{+}$ conc. $=10^4$ times = ten thousand times.