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How much of 0.3 M NH(4) should be mixed...

How much of `0.3 M NH_(4)` should be mixed with 30 mL of `NH_(4)Cl` to give a buffer solution of `pH 10.pk_(b)" for " NH_(4)OH "is " 4.75`.

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The correct Answer is:
`V = 112.6` mL
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