In what volume ratio should you mix 1.0 ...

In what volume ratio should you mix 1.0 M solution of `NH_(4)CI` and `NH_(3)` to produce a buffer solution of pH 9.80 `[pK_(b) (NH_(3)) = 4.74]`

A

`1 :3.5`

B

`3.5 : 1`

C

`2 : 1`

D

`1 : 2`

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A

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