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pH and Salt Hydrolysis
Concepts tested here
- pH at equivalence of weak acid and strong base
All Questions
2000 AIPMT 1 question
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Which statement is wrong about pH and $H^+$Neutral water has pH 7 at 25 °C, not zero; true.
Equal amounts of acetic acid (weak acid) and NaOH (strong base) give sodium acetate. The acetate ion hydrolyses ($CH_3COO^- + H_2O \rightleftharpoons CH_3COOH + OH^-$), so the solution is basic with pH greater than 7, not 7. So this statement is wrong.
Dilute acid has lower $[H^+]$ than concentrated acid, so its pH is higher; true.
A mixture of two acids is acidic, pH less than 7; true.
So the wrong statement is that mixing 1 N $CH_3COOH$ and 1 N NaOH gives pH seven.