Answer to Question #56024 in Inorganic Chemistry for Chaloni

Question

A procedure similar to that described in this experiment can be used to precipitate Cl- as AgCl. A sample containing chloride weighing 0.207 g was precipitated with Ag+, and the AgCl produced weighed 0.472 g. Calculate the mass % of Cl- in the original sample.

Answer 1

Ag+ + Cl- = AgCl
n(Cl) = n(AgCl) = m(AgCl)/MW(AgCl);
m(Cl) = nCl AW(Cl);
w(Cl) = m(Cl/m_sample) = (m(AgCl) AW(Cl))/(m_sample MW(AgCl))
w(Cl) = (0.472 g 35.45 g mol-1)/(0.207 g 143.3182 g mol-1) = 56.4 %