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A weak acid HA has K(a) = 10^(-6). What ...

A weak acid `HA` has `K_(a) = 10^(-6)`. What would be the molar ratio of this acid and its salt with strong base so that `pH` of the buffer solution is `5`?

A

1

B

2

C

10

D

`1//10`

Text Solution

Verified by Experts

The correct Answer is:
C
`pK_(a) = 6` . Now , for an acidic buffer , `5 = 6 + log . "[Salt]"/"[Acid]" " or " "[Acid]"/"[Salt]" = 10`.
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Knowledge Check

  • Assertion: The pH of a buffer solution does not change appreciably on additions of a small amount of an acid or a base. Reason: A buffer solution consists of either a weak acid and its salt with a strong base or a weak base its salt with a strong acid.

    A
    If both Assertion and Reason are CORRECT and a Reason is the CORRECT explanations of the Assertion
    B
    If both Assertion and Reason are CORRECT but Reaon is not CORRECT explanation of the Assertion.
    C
    If Assertion is CORRECT but Reasson is INCORRECT.
    D
    If Assertion is INCORRECT but Reason is CORRECT.

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