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pH of a buffer with equal concentrations of weak acid and its salt, given Ka

The same question, asked 3 times: 10 May 2023 S2, 13 Apr 2026 S2*, 20 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    10 May 2023 S2

    70
    A buffer solution contains equal concentrations of weak acid and its salt with strong base. Calculate pH of buffer solution if dissociation constant of weak acid is 1.8×10−51.8 \times 10^{-5}.

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  2. Question 2

    13 Apr 2026 S2

    9
    Find the pH of a solution formed by mixing equal volume of solution of 0.10.1 M sodium propionate and 0.10.1 molar propionic acid. (Given The dissociation constant of propionic acid is 1.3×10−51.3 \times 10^{-5})

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  3. Question 3

    20 Apr 2026 S2

    9
    Calculate the pH of buffer solution containing 0.1M CH3COOH\mathrm{CH_3COOH} and 0.1 M CH3COONa\mathrm{CH_3COONa} [Ka=1.8×10−5][K_a = 1.8 \times 10^{-5}]

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