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100ml of a solution of HCl with pH value 3 is diluted with \( 400 \mathrm{ml} \) of water. The new pH of the solution is?

1. 3.7
2. 5.3
3. 4.2
4. 5.6

Correct answer: 3.7

Solution

When the acidic solution is diluted, the pH increases, as the concentration of hydrogen ions decreases. The new pH can be calculated using the dilution formula. [AI-generated key — verify before high-stakes use]

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