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The pH of 0.5 M aqueous solution of HF ...

The `pH` of `0.5 M` aqueous solution of `HF`
`(K_(a)=2xx10^(-4))` is

A

2

B

4

C

6

D

10

Text Solution

Verified by Experts

The correct Answer is:
A
`[H^(+)] = sqrt(cK_(a)) = sqrt(0.5 xx 2xx 10^(-4)) = 10^(-2) M `
` pH = - log _(10) [H^(+) = - log 10^(-2) = 2 `
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FIITJEE-IONIC EQUILIBRIUM -SOLVED PROBLEM (OBJECTIVE )
  1. 0.1 mole of CH(3)NH(2) (K(b)=5xx10^(-4)) is mixed with 0.08 mole of HC...

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  2. The K(sp) of Mg(OH)(2) is 1xx10^(-12). 0.01 M Mg(OH)(2) will precipita...

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  3. K(a) for HCN is 5.0xx10^(-10) at 25^(@)C. For maintaining a constant p...

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  4. A cetrain ion B^(-) has an Arrhenius constant for basic character (eq....

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  5. The pH of 0.5 M aqueous solution of HF (K(a)=2xx10^(-4)) is

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  6. The hydroxyl ion concentration in a solution having pH value 3 will ...

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  7. A 50 ml solution of pH=1 is mixed with a 50 ml solution of pH=2. The p...

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  8. The pH of a solution obtaine by mixing 50 mL of 0.4 N HCl and 50 mL of...

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  9. What is the pH of the buffer solution containing 0.15 mol of NH(4)O...

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  10. The pH of a buffer solution prepared by adding 10 mL of 0.1 M CH(...

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  11. The pH of a solution obtained by mixing 100 mL of 0.2 M CH3COOH with 1...

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  12. The pH of 0.02 M NH(4)Cl (aq) (pK(b)=4.73) is equal to

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  13. When 2.5 mL of 2//5M weak monoacidic base (K(b) = 1 xx 10^(-12) at 25^...

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  14. If an acidic indicator HIn ionies as HInhArrH^(+)+In^(-). To which max...

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  15. Which of the following will have nearly equal H^(+) concentration ?

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  16. Which of the following statement (s) is (are) correct ?

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  17. A buffer solution can be prepared from a mixture of

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  18. Choose the correct statement (s) out of the following

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  19. When a salt reacts with water to form acidic or basic solution , t...

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