How do you use gravimetric analysis to find the mass composition of a solid sample?
Gravimetric analysis is the determination of the amount of a constituent by measuring the mass of a solid.
In gravimetric analysis, you usually add a reagent to a solution of your unknown and determine the mass of the precipitate that forms.
Since you know the formula of the precipitate, you can work backwards to calculate the mass of the unknown.
You dissolve 0.4500 g of impure potassium chloride in water and add an excess of silver nitrate. You get 0.8402 g of insoluble silver chloride. Calculate the percent by mass of
The chemical equation is
You work backwards from the mass of