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In a buffer solution containing equal concentration of B⁻ and HB, the Kb for B⁻ is 10⁻¹⁰. The pH of buffer solution is:

1. 10
2. 7
3. 6
4. 4

Correct answer: 7

Solution

In a buffer solution with equal concentrations of B⁻ and HB, the pH is determined by the pKa of HB. Since Kb for B⁻ is 10⁻¹⁰, Ka for HB is 10⁻⁴ (using Ka × Kb = 10⁻¹⁴). Thus, pKa = 4, and pH = 7 (neutral point) due to equal concentrations.

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