How much of 0.3 M ammoniumhydroxide should be mixed with 30 mL of 0.2 M solution of ammonium chloride to give a buffer solution of pH 10. Given pK_(b) for NH_(4)OH is 4.75.

How much of 0.3 M ammoniumhydroxide should be mixed with 30 mL of 0.2

1.	How much of 0.3 M ammoniumhydroxide should be mixed with 30 mL of 0.2 M solution of ammonium chloride to give a buffer solution of pH 10. Given pK_(b) for NH_(4)OH is 4.75.
Answer» Solution :`pOH = 14 - PH = 14 - 0 = 4 ` `pOH = pK_(b) + log .(["Salt"])/(["Base"]), 4= 4.75 + log.(["Salt"])/(["Base"]) or log.(["Salt"])/(["Base"]) = - 0.75 = 1.25 or (["Salt"])/(["Base"]) = 0.1778` i.e.,`("Moles of salt")/("Moles of base")=0.1778 or ((0.2)/(1000)xx30)/((0.3)/(1000)xxV)=0.1778` or `V = 112.5 ML`