An aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water (ignoring dissociation of water). The …
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PYQAn aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water (ignoring dissociation of water). The pH of HCl solution would
(Given log 2 = 0.30)
[JEE Main 2025, 7 Apr (Shift 1)]
✓ Correct answer: b)
increase to 1.3
Explanation
Initial pH = 1
[H⁺] = 10⁻¹ M
After adding equal volume of water → concentration becomes half
New [H⁺] = (10⁻¹) / 2
pH = −log(10⁻¹ / 2)
pH = −[log(10⁻¹) − log(2)]
pH = −[−1 − 0.30]
pH = 1 + 0.30
pH = 1.30
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