sample of silver metal is suspected to be contaminated with zinc. A 0.2365 g portion

Question

of this metal is dissolved in nitric acid and the silver ions precipitated with excess

aqueous NaCl. After filtering and drying, the mass of the precipitate is found to be

0.2865 g. What was the purity of the original silver metal (in %w/w)?

Answer 1

the molar mass of silver chloride is 143.32 g

the molar mass of silver is 107.87 g

so the mass of silver in the processed sample is
... .2865 * 107.87 / 143.32

the processed mass divided by the original sample mass is the purity of the original sample