Sodium benzoate, C₆H₅COONa, is used to keep food from spoiling. What is the pH of a 0.10 mol L⁻¹ solution of sodium benzoate at 298 K? For benzoic acid, pKa = 4.20; take Kw = 1.0 × 10⁻¹⁴.

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Sodium benzoate, $\text{C}_6\text{H}_5\text{COONa}$ , is used to keep food from spoiling. What is the pH of a $0.10\ \text{mol L}^{-1}$ solution of sodium benzoate at $298\ \text{K}$ ? For benzoic acid, $\text{p}K_a = 4.20$ ; take $K_w = 1.0 \times 10^{-14}$ .

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← One litre of a buffer holds 0.30 mol of ammonia and 0.20 mol of ammonium chloride at 298 K. Then 0.050 mol of solid sodium hydroxide is dissolved in it, with no change in volume. What is the pH of the buffer now? Take pKb(NH₃) = 4.75, log 3 = 0.477 and log 7 = 0.845.A weak monobasic acid HA has Ka = 2.5 × 10⁻³ at 298 K. What percentage of the acid is ionised in a 0.050 mol L⁻¹ solution of HA at 298 K? Do not assume that the degree of ionisation is small compared with 1. →

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