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

Question

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 (A) 5 times (B) 1000 times (C) 105 times (D) 4 times

Tardigrade Admin · Accepted Answer

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. = 105 times.

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 $O H^{-}$ ion concentration is

5 times

1000 times

$1 0^{5}$ times

4 times

$p H = 7$ means $[H^{+}] = 1 0^{- 7}$ or $[O H^{-}] = 1 0^{- 7}$ $p H = 12$ means $[H^{+}] = 1 0^{- 12}$ or $[O H^{-}] = 1 0^{- 2}$ Hence, increase in $O H^{-}$ conc. $= 1 0^{5}$ times.

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