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pH or pOH of an NH4OH and NH4Cl buffer from pKb and the concentrations

The same question, asked 3 times: 2 May 2023 S1*, 15 May 2023 S1*, 13 May 2026 S2. Every wording below, oldest first.

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  1. Question 1

    2 May 2023 S1

    75
    What is the value of pOH if a buffer solution is prepared by mixing equal volumes of 0.4 M NH4_4OH and 0.5 M NH4_4Cl solutions. pKb_b = 4.730

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  2. Question 2

    15 May 2023 S1

    89
    A buffer solution is prepared by mixing 0.2 M NH4_4OH and 1 M NH4_4Cl. What is the pH value of buffer solution? (Give pKb=7.744\text{p}K_{b} = 7.744)

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  3. Question 3

    13 May 2026 S2

    10
    One litre of a buffer solution containing 0.010.01 M NH4Cl\mathrm{NH_4Cl} and 0.10.1 M NH4OH\mathrm{NH_4OH} has pKbpK_b value of 55. Find the pH.

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