Question:
Which of the following aqueous solution of salt have \(pH < 7\) at \(298\) K?
Which of the following aqueous solution of salt have \(pH < 7\) at \(298\) K?
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A salt of a strong acid and a weak base gives an acidic solution.
Updated On: Oct 1, 2026
- \(\text{KNO}_3\)
- \(\text{Na}_2\text{CO}_3\)
- \(\text{CH}_3\text{COONH}_4\)
- \(\text{CuCl}_2\)
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The Correct Option is D
Solution and Explanation
Step 1: Classify each salt
(A) KNO\(_3\): strong base + strong acid, neutral, pH \(=7\).
(B) Na\(_2\)CO\(_3\): strong base + weak acid, basic, pH \(>7\).
(C) CH\(_3\)COONH\(_4\): weak acid + weak base with nearly equal strengths, about neutral.
(D) CuCl\(_2\): weak base Cu(OH)\(_2\) + strong acid HCl, acidic.
Step 2: Reason for (D)
Cu\(^{2+}\) hydrolyses: \(\text{Cu}^{2+}+2\text{H}_2\text{O}\rightleftharpoons\text{Cu(OH)}_2+2\text{H}^+\). Extra H\(^+\) makes pH \(<7\).
Final Answer:
CuCl\(_2\) solution is acidic, option (D). \[ \boxed{\text{(D) CuCl}_2} \]
(A) KNO\(_3\): strong base + strong acid, neutral, pH \(=7\).
(B) Na\(_2\)CO\(_3\): strong base + weak acid, basic, pH \(>7\).
(C) CH\(_3\)COONH\(_4\): weak acid + weak base with nearly equal strengths, about neutral.
(D) CuCl\(_2\): weak base Cu(OH)\(_2\) + strong acid HCl, acidic.
Step 2: Reason for (D)
Cu\(^{2+}\) hydrolyses: \(\text{Cu}^{2+}+2\text{H}_2\text{O}\rightleftharpoons\text{Cu(OH)}_2+2\text{H}^+\). Extra H\(^+\) makes pH \(<7\).
Final Answer:
CuCl\(_2\) solution is acidic, option (D). \[ \boxed{\text{(D) CuCl}_2} \]
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