A buffer is prepared containing 0.75 M NH3 and 0.20 M NH4 . Calculate the pH of the buffer using the Kb for NH3. g

pH=8.676

Explanation:

Given:

0.75 M

0.20 M

The objective is to calculate the pH of the buffer using the kb for

Formula used:

pH=14-pOH

Solution:

On substituting salt=0.75 and base=0.20 in the formula

pH=14-pOH

On substituting the pOH value in the above expression,

pH=14-5.324

Therefore,

pH=8.676

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