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Then pKa of a certain weak acid is 4.0. ...

Then `pK_a` of a certain weak acid is 4.0. What should be the [salt] ratio if we have to prepare a buffer with pH=5 using the acid and one of the salts?

A

`10:1`

B

`1:10`

C

`4:5`

D

`5:4`

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The correct Answer is:
A
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