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pH of a weak acid or base from its percent dissociation

This type of question, asked 7 times: May 2022 S1, 16 May 2023 S2, 21 Apr 2025 S1, 25 Apr 2025 S2, 26 Apr 2025 S2, 13 Apr 2026 S1, 19 May 2026 S1. All 7 questions below, oldest first.

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  1. Question 1

    May 2022 S1

    100
    What is the pH of 2×10−32 \times 10^{-3} M solution of monoacidic weak base if it ionises to the extent of 5%?

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  2. Question 2

    16 May 2023 S2

    59
    Calculate the pH of 0.02 M monobasic acid having 2% dissociation.

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  3. Question 3

    21 Apr 2025 S1

    90
    What is the value of pH of a NaOH solution that dissociates 2%2\% in its 0.01 M solution?

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  4. Question 4

    25 Apr 2025 S2

    70
    Calculate the pH of centimolar solution of monoacidic weak base. Which is 10%10\% dissociated in its aqueous solution?

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  5. Question 5

    26 Apr 2025 S2

    96
    What is pH of weak dibasic acid, that is 2%2\% dissociated in its M/100 solution at 298 K ?

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  6. Question 6

    13 Apr 2026 S1

    9
    A weak monobasic acid is 0.04 % dissociated in 0.25 M solution. What is pH of the solution?

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  7. Question 7

    19 May 2026 S1

    10
    Phosphoric acid dissociates upto 80% in its 0.020.02 M solution at 25∘C25^\circ\mathrm{C}. Calculate the pH of the solution.

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