Suatu sampel garam nitrat, AgNO3 mengandung 60,35% perak. Berapa persen kemurnian AgNO3 dalam sampel?

% Ag = ( Ar Ag / Mr AgNO3 ) × 100% = 60,35%

Mr AgNO3 = Ar Ag + Ar N + 3 Ar O = 108 + 14 + 48 = 160

Misal m sampel = 100 gram

Maka m Ag = 60,35 gram

m Ag = (Ar Ag / Mr AgNO3) × m AgNO3
m AgNO3 = m Ag × Mr AgNO3 / Ar Ag
m AgNO3 = 60,35 gram × 160 / 108 = 89,407 gram

% AgNO3 = ( m AgNO3 / m sampel ) × 100% = ( 89,407 gram / 100 gram ) × 100% = 89,407 %