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Converting between pH, pOH, H+ and OH- concentrations

This type of question, asked 12 times: 4 May 2023 S2, 9 May 2024 S2, 10 May 2024 S1, 11 May 2024 S1, 13 May 2024 S2, 19 Apr 2025 S1, 19 Apr 2025 S2, 13 Apr 2026 S2, 19 Apr 2026 S1, 19 Apr 2026 S2, 20 Apr 2026 S2, 12 May 2026 S1. All 13 questions below, oldest first.

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  1. Question 1

    4 May 2023 S2

    100
    Calculate the [OH⁻] if pOH of solution is 4.94

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  2. Question 2

    9 May 2024 S2

    91
    What is the pH of a solution containing 2.2×10−62.2 \times 10^{-6} M hydrogen ions?

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  3. Question 3

    10 May 2024 S1

    82
    Calculate concentration of H+^+ ions in a solution if pOH is 11.

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  4. Question 4

    11 May 2024 S1

    73
    What is the concentration of OH−OH^- ion in a solution containing 0.05 M H+0.05\text{ M } H^+ ions?

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  5. Question 5

    13 May 2024 S2

    52
    What is the pH of solution containing 4.62×10−4 M H+4.62\times10^{-4}\ \text{M H}^+ ions?

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  6. Question 6

    19 Apr 2025 S1

    81
    The pH of a sample of vinegar is 3.76. Calculate the concentration of hydrogen ion in it in oldm−3oldm^{- 3} ?

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  7. Question 7

    19 Apr 2025 S2

    100
    If pH of solution changes from 4 to 5 , then the H3O+H_{3}O^{+}ion concentration of solution

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  8. Question 8

    13 Apr 2026 S2

    10
    What is the concentration of hydrogen ion in the solution when the concentration of hydroxyl ion is 0.080.08 mol / dm3\mathrm{dm^3} at 298298 K ?

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  9. Question 9

    19 Apr 2026 S1

    12
    What is the pH of solution containing 5×10−4 M H+5 \times 10^{-4}\ \mathrm{M\,H^+} ion?

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  10. Question 10

    19 Apr 2026 S2

    10
    Calculate the [H3O+][\mathrm{H_3O^+}] if pH of the solution is 4.254.25

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  11. Question 11

    19 Apr 2026 S2

    11
    If [H3O+][\mathrm{H_3O^+}] of a solution is 1×10−41 \times 10^{-4}. What is the value of pOH at 298 K298\ \mathrm{K} ?

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  12. Question 12

    20 Apr 2026 S2

    8
    There are two different solutions, A and B. The pH of solution A is 4. Find the pH of solution B having [H+][\mathrm{H^+}] three times that of solution A.

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  13. Question 13

    12 May 2026 S1

    10
    What is the POH\mathrm{P^{OH}} of solution having [H3O+] 1×10−4[\mathrm{H_3O^+}]\ 1 \times 10^{-4} at 298298 K?

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