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pH of a buffer from pKa and the concentrations of weak acid and its salt

The same question, asked 9 times: 3 May 2023 S1*, 4 May 2023 S1*, 9 May 2023 S2*, 9 May 2024 S1*, 10 May 2024 S2*, 12 May 2024 S1*, 12 May 2024 S2*, 19 Apr 2025 S2*, 20 Apr 2025 S1. Every wording below, oldest first.

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  1. Question 1

    3 May 2023 S1

    100
    Calculate the pH of buffer solution containing 0.027 M weak acid and 0.054 M of its salt with strong base if pKapK_a is 4.2.

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  2. Question 2

    4 May 2023 S1

    68
    Calculate the pH of a buffer solution containing 0.35 M weak acid and 0.70 M of its salt with strong base if pKa\text{p}K_a is 4.56.

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  3. Question 3

    9 May 2023 S2

    95
    Calculate the pH of buffer solution containing 0.04 M NaF and 0.02 M HF (pKa_a = 3.142).

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  4. Question 4

    9 May 2024 S1

    65
    The buffer solution is prepared by mixing 0.2 M sodium acetate and 0.1 M acetic acid. If pKapK_a for acetic acid is 4.7, find the pH.

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  5. Question 5

    10 May 2024 S2

    51
    Calculate the pH of a buffer solution containing 0.01 M salt and 0.004 M weak acid (pKa=4.762pK_a=4.762)

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  6. Question 6

    12 May 2024 S1

    68
    What is pH of solution containing 50 mL each of 0.1 M sodium acetate and 0.01 M acetic acid? (pKa(CH3COOH)=4.50pK_a(\text{CH}_3\text{COOH})=4.50)

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  7. Question 7

    12 May 2024 S2

    65
    A buffer solution is prepared by mixing 0.01 M weak acid and 0.05 M solution of a salt of weak acid and strong base. What is the pH of buffer solution? (pKa = 4.74)

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  8. Question 8

    19 Apr 2025 S2

    64
    What is the pH of buffer solution prepared by mixing 0.01 M weak acid and 0.02 M salt of weak acid with strong base? (pKa=4.680)\left( pK_{a}= 4.680 \right)

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  9. Question 9

    20 Apr 2025 S1

    81
    What is the pH of buffer solution formed by mixing 0.01 M acetic acid and 0.05 M sodium acetate? (pKa=4.7447)\left( pK_{a}= 4.7447 \right)

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