Gravimetric Analysis relies on the measurement of mass.

• For estimating Chloride ions, Silver nitrate ($AgN{O}_3$) is added to the sample.
• Precipitate: Silver Chloride ($AgCl$), which is a white, curdy solid. $A{g}^{+}+C{l}^{-}\to AgCl\downarrow$
• The precipitate is filtered, washed to remove impurities, dried, and weighed. Knowing the mass of $AgCl$ allows for the stoichiometric calculation of the amount of chloride present in the original sample.