Answer : The
pH of a solution is, 8.56
Explanation : Given,

Concentration of ammonia (base) = 0.10 M
Concentration of ammonium nitrate (salt) = 0.55 M
First we have to calculate the value of
.
The expression used for the calculation of
is,

Now put the value of
in this expression, we get:



Now we have to calculate the pOH of buffer.
Using Henderson Hesselbach equation :
![pOH=pK_b+\log \frac{[Salt]}{[Base]}](https://tex.z-dn.net/?f=pOH%3DpK_b%2B%5Clog%20%5Cfrac%7B%5BSalt%5D%7D%7B%5BBase%5D%7D)
Now put all the given values in this expression, we get:


The pOH of buffer is 5.44
Now we have to calculate the pH of a solution.

Thus, the pH of a solution is, 8.56