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The pH of a buffer containing equal mola...

The pH of a buffer containing equal molar concentrations of a weak base and its chloride
`(K_(b))` forweak base `=2xx10^(-5)`, log 2=0.3) is

A

5

B

9

C

4.7

D

9.3

Text Solution

Verified by Experts

The correct Answer is:
D
`pOH= - log K_(b)+log (["SALT"])/({"BASE"])`
`= - log K_(b)("since" ("SALT")/("BASE")=1)`
`=- log 2xx10^(-5)=4.7`
`pH+pOH=14`
`therefore pH=9.3`
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