A solution at 298 K contains benzoic acid at 0.10 mol L⁻¹ (Ka = 6.4 × 10⁻⁵) and acetic acid at 0.20 mol L⁻¹ (Ka = 1.8 × 10⁻⁵). Both acids are weak, and each is only slightly ionised. What is the pH of the solution?

ChemistryAdvancedHigh School (11–12)Acids, Bases and Salts › Acids and Bases JEE Advanced

A solution at $298\ \text{K}$ contains benzoic acid at $0.10\ \text{mol L}^{-1}$ ( $K_a = 6.4 \times 10^{-5}$ ) and acetic acid at $0.20\ \text{mol L}^{-1}$ ( $K_a = 1.8 \times 10^{-5}$ ). Both acids are weak, and each is only slightly ionised. What is the pH of the solution?

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← At 298 K, the standard Gibbs energies of formation are NO₂(g) +51.3 kJ mol⁻¹ and N₂O₄(g) +97.9 kJ mol⁻¹. A vessel at 298 K holds N₂O₄ at 0.90 bar and NO₂ at 0.15 bar. For N₂O₄(g) ⇌ 2 NO₂(g) in this mixture, which statement is correct? Take R = 8.314 J K⁻¹ mol⁻¹.Next →

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