Identifying Chlorine Minerals

Precipitation as Silver Chloride. Chloride is precipitated from a dilute nitric acid solution as silver chloride, AgCI, by the addition of a small amount of silver nitrate, AgNO_3. The test is very delicate, traces of chlorine being shown by a milky appearance of the solution. When in any quantity the precipitate is curdy in form. It is white on precipitation but darkens on exposure to light. It is soluble in ammonium hydroxide. The rare elements, bromine and iodine, would give similar reactions.