A sample of water was known to contain chloride ions. To determine the concentration of chloride ions in the water sample, a student added a solution of silver nitrate to 500mL of the water. 1.26g of silver chloride percipitate formed. What was the concentration of chloride ions in the water sample?

Answer 1

Convert g AgCl to mols. mols = grams/molar mass
There is 1 mol Cl to 1 mol AgCl; therefore, mols Cl is the same as mols AgCl.
Then M = mols/L soln.