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At 25^(@), Ka for a weak acid, HA in wat...

At `25^(@)`, `K_a` for a weak acid, HA in water, is `10^(-5)`, `V_2mL` of 0.1(M) NaOH solution is added to `V_1mL` of 0.1(M) solution of HA. How many time would `V_1`be of `V_2` so that pH of the solution be 6-

A

2 times

B

1.5 times

C

1.1 times

D

1.4 times

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • At 25^(@) , K_b for CN^- (conjugate base of HCN) is 2.5xx10^(-5) . If 25 mL of 0.01(M) aqueous NaOH solution is added to 50mL of 0.01(M) HCN solution, then-

    A
    pH of the resulting solution is 11.2
    B
    pH of the resulting solution is 9.4
    C
    at `25^(@)C` the ionisation constant for HCN is `4xx10^(-10)`
    D
    at `25^(@)C` the ionisation constant for HCN is `2.5xx10^(-5)`

  • At 25^(@) C, K_b for CH_3COO^(0-) ion in water is 5.55xx10^(-10) If 100mL of 0.025(M) HCl solution is added to 50mL of 0.1(M) solution of CH_3COONa , pH of the resulting solution will be-

    A
    3.82
    B
    8.64
    C
    4.74
    D
    7.8

  • 100 mL of 30% (m/v) NaOH solution is mixed with 100 mL of 90% (m/v) NaOH solution then the molarity of final solution will be-

    A
    1.3
    B
    13
    C
    `1//5`
    D
    15

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