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Q.
Which of the following salts will give highest $ pH $ in water?
AIPMTAIPMT 2014Equilibrium
Solution:
The highest $pH$ refers to the basic solution containing $OH ^{-}$ions. Therefore, the basic salt releasing more $OH ^{-}$ions on hydrolysis will give highest $pH$ in water.
Only the salt of strong base and weak acid would release more $OH ^{-}$ion on hydrolysis. Among the given salts, $Na _{2} CO _{3}$ corresponds to the basic salt as it is formed by the neutralisation of $NaOH$ [strong base] and $H _{2} CO _{3}$ [weak acid].
$CO _{3}^{2-}+ H _{2} O \rightleftharpoons HCO _{3}^{-}+ OH ^{-}$