Given, concentration of salt (NH4Cl)=0.01M Concentration of base (NH4OH)=0.1M pKb=5 Volume of buffer solution =10L A mixture of NH4OH and NH4Cl forms basic buffer solution. The Henderson's equation for a basic buffer solution is pOH=pKb+log‌
[Salt]
[‌ Base ‌]
pKb=−log‌Kb=−log‌0‌l=1 By substituting values in the above equation, we get pOH=5+log‌