A buffer solution is prepared by mixing 0.2 moles of ammonia and 0.3 moles of ammonium chloride in 500 mL of solution. Calculate the pH of this buffer solution. The \(k_b\) base dissociation constant of ammonia is \(1.8 \times 10^{-5}.\)
1
7
2
7.5
3
8.5
4
9