You analyzed 2.475 g of a mixture of NaCl, SiO2, and CaCO3. You isolate 0.825 g NaCl, 0.825 g of CaCO3, and 0.580 g SiO2. You were told that the original mixture contained 35% NaCl, 45% CaCO3, and 20% SiO2. Report two possible sources of error.

Given data :

Mass of the mixture = 2.475 gms

% of NaCl = 35%

% of CaCO₃ = 45%

% of SiO₂ = 20%

So,

Mass of NaCl in the mixture = 35% of 2.475 gms = 0.866 gms

Mass of CaCO₃ in the mixture = 45% of 2.475 gms = 1.1137 gms

Mass of SiO₂ in the mixture = 20% of 2.475 gms = 0.495 gms

But we only isolate 0.825 g NaCl, 0.825 g of CaCO₃, and 0.580 g SiO₂. So, there is a decrease in the composition.