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  4. 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

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Q. 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

Equilibrium

Solution:

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.