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Ostwald dilution law: Ka, Kb, degree of dissociation or concentration of a weak acid or base

This type of question, asked 26 times: 3 May 2023 S2, 4 May 2023 S1, 9 May 2023 S1, 10 May 2023 S2, 11 May 2023 S1, 15 May 2023 S1, 10 May 2024 S1, 10 May 2024 S2, 11 May 2024 S2, 13 May 2024 S2, 14 May 2024 S1, 14 May 2024 S2, 21 Apr 2025 S2, 22 Apr 2025 S1, 22 Apr 2025 S2, 23 Apr 2025 S1, 25 Apr 2025 S1, 25 Apr 2025 S2, 26 Apr 2025 S1, 15 Apr 2026 S1, 18 Apr 2026 S2, 19 Apr 2026 S1, 19 Apr 2026 S2, 12 May 2026 S2, 14 May 2026 S2, 15 May 2026 S1. All 27 questions below, oldest first.

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  1. Question 1

    3 May 2023 S2

    86
    Calculate 'α\alpha' for 0.1 M acetic acid [Ka=1.0×10−5][K_a=1.0\times10^{-5}]

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  2. Question 2

    4 May 2023 S1

    92
    Calculate the concentration of weak monobasic acid if its degree of dissociation and dissociation constant are 5.0×10−45.0\times10^{-4} and 5.0×10−95.0\times10^{-9} respectively.

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  3. Question 3

    9 May 2023 S1

    92
    Dissociation constant and degree of dissociation of weak acid are 1.8×10−51.8\times10^{-5} and 0.03 respectively. What will be the concentration of solution of weak acid?

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  4. Question 4

    10 May 2023 S2

    51
    Calculate dissociation constant of a weak monobasic acid if it is 0.05% dissociated in 0.02 M solution.

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  5. Question 5

    11 May 2023 S1

    86
    A monobasic acid is 5% dissociated in its 0.02 M solution. Calculate the dissociation constant of acid.

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  6. Question 6

    15 May 2023 S1

    99
    The dissociation constant of a weak monobasic acid is 3.2×10−43.2\times10^{-4}. Calculate the degree of dissociation in its 0.04 M solution.

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  7. Question 7

    10 May 2024 S1

    51
    Acetic acid dissociated to 1.20% in its 0.01 M solution. Value of dissociation constant is

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  8. Question 8

    10 May 2024 S2

    58
    Weak acid HX has dissociation constant 1×10−51\times10^{-5}. Calculate the percent dissociation in its 0.1 M solution.

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  9. Question 9

    11 May 2024 S2

    66
    A weak base is 1.42%1.42\% dissociated in its 0.05 M solution. Calculate its dissociation constant.

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  10. Question 10

    13 May 2024 S2

    55
    What is the molar concentration of acetic acid if value of it's dissociation constant is 1.8×10−51.8\times10^{-5} and degree of dissociation is 0.02?

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  11. Question 11

    14 May 2024 S1

    84
    Calculate dissociation constant of 0.001 M weak monoacidic base undergoing 2% dissociation.

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  12. Question 12

    14 May 2024 S2

    51
    An organic monobasic acid has dissociation constant 2.25×10−62.25 \times 10^{-6}. What is percent dissociation in its 0.01 M solution?

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  13. Question 13

    21 Apr 2025 S2

    73
    A monobasic weak acid dissociates to 1.2%1.2\% in its 0.01 M solution at 298 K . Calculate dissociation constant of it.

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  14. Question 14

    22 Apr 2025 S1

    89
    Calculate the value of dissociation constant of weak monoacidic base if it dissociates to 2%2\% in 0.1 M solution?

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  15. Question 15

    22 Apr 2025 S2

    71
    A weak monoacidic base dissociates to 1.5%1.5\% in 0.001 M solution at 298 K . Calculate the dissociation constant of weak base.

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  16. Question 16

    23 Apr 2025 S1

    61
    A weak base is 5%5\% dissociated in its 0.01 M solution. Calculate the dissociation constant.

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  17. Question 17

    25 Apr 2025 S1

    75
    Calculate the value of dissociation constant of weak acid, which dissociates to 0.01%0.01\% in its 0.1 M solution?

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  18. Question 18

    25 Apr 2025 S2

    90
    A monobasic weak acid dissociates 2%2\% in its 0.002 M solution. Calculate the dissociation constant of weak acid.

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  19. Question 19

    26 Apr 2025 S1

    65
    Dissociation constant of 0.01 M weak acid is 10−410^{- 4}. What is percent dissociation of acid?

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  20. Question 20

    15 Apr 2026 S1

    10
    The dissociation constant of weak acid HA is 1.5×10−51.5 \times 10^{-5}. Find the percent dissociation, containing 0.20.2 moles per 22 liters of solution.

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  21. Question 21

    18 Apr 2026 S2

    11
    An organic monobasic acid has dissociation constant 1.96×10−81.96 \times 10^{-8}. What is its percentage dissociation in 0.010.01 M solution ?

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  22. Question 22

    19 Apr 2026 S1

    11
    A weak base is 1.3%1.3\% dissociated in its aqueous solution. If KbK_b for weak base is 1.69×10−51.69 \times 10^{-5} at 298298 K. Find the concentration of aqueous solution of weak base.

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  23. Question 23

    19 Apr 2026 S2

    12
    Calculate the molar concentration of weak monobasic acid if Ka=1.8×10−5K_a = 1.8 \times 10^{-5} and degree of dissociation is 0.010.01 ?

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  24. Question 24

    12 May 2026 S2

    9
    A weak monobasic acid is 0.08%0.08\% dissociated in 0.020.02M solution. Calculate the dissociation constant of weak acid.

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  25. Question 25

    14 May 2026 S2

    10
    Calculate the amount of acetic acid in one liter of its solution if the degree of dissociation is 1.3%1.3\% [Ka=1.8×10−5][K_a = 1.8 \times 10^{-5}]

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  26. Question 26

    14 May 2026 S2

    9
    Calculate the dissociation constant of weak monobasic acid if it dissociates to 0.04%0.04\% in 0.20.2 M solution.

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  27. Question 27

    15 May 2026 S1

    10
    If the dissociation constant of NH4OH\mathrm{NH_4OH} is 1.8×10−51.8 \times 10^{-5}, calculate its degree of dissociation in 0.010.01 M.

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