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  4. The pH of a solution is 7.00. To this solution sufficient base is added to increase the pH to 12.0.The increase in OH- ion concentration is

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Q. The pH of a solution is 7.00. To this solution sufficient base is added to increase the pH to 12.0.The increase in $OH^-$ ion concentration is

Equilibrium

Solution:

$pH = 7$ means $[H^+] = 10^{-7}$ or $[OH^-] = 10^{-7}$ $pH = 12$ means $[H^+] = 10^{-12}$ or $[OH^-] = 10^{-2}$ Hence, increase in $OH^-$ conc. $= 10^5$ times.