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What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed?

1. 12.65
2. 2.0
3. 7.0
4. 1.04

Correct answer: 12.65

Solution

When equal volumes of NaOH and HCl are mixed, the moles of each are calculated. NaOH has 0.1 M × V moles, and HCl has 0.01 M × V moles. The excess OH⁻ concentration is (0.1 - 0.01) M = 0.09 M. The pOH is -log(0.09), and pH = 14 - pOH ≈ 12.65.

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