A buffer solution with pH 9 is to be prepared by mixing `NH_(4)OH` solution . `K_(b) =1.8 xx 10^(-5).`

Explanation

To prepare a buffer solution with a pH of 9 using NH₄OH, we can follow these steps:

### Step 1: Determine the pOH
Given that the pH of the buffer solution is 9, we can find the pOH using the relationship:
\[ \text{pOH} = 14 - \text{pH} \]
Substituting the given pH:
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