Cations: Ag + , Hg 2 2+ , Pb 2+ , Bi 3+ , Cu 2+ , As 3+ , Co 2+ , Ni 2+ , Fe 3+

Question

Cations: Ag+, Hg22+, Pb2+, Bi3+, Cu2+, As3+, Co2+, Ni2+, Fe3+, Al3+

Anions: SO42-, CO32-, PO43-, Cl-, NO3-

A.) List the cations whose chlorides are insoluble in water.

B.) A salt was completely soluble in water. When this solution was treated with AgNO3 no precipitate was formed. What anions could be present?

C.) An unknown solution was treated with BaCl2 and a white precipitate formed which did not dissolve in hydrochloric acid. What anion(s) could be present in the unknown solution?

D.) What technique(s) would you use to collect a solid product from an aqueous solution?Describe.

E.) Why do you separate the cations in different groups before performing individual tests? How do you separate them into groups?

Explanation / Answer

A) chlorides are insoluble in water = Ag+ , Pb2+ and Hg22+.

B) NO3-

C) SO4-2

SO4-2 + BaCl2 --------------------> BaSO4 (s) + 2Cl-

D) centrifugation technique used to seperate solid .

E)

seperation of all cations are very difficult task these cations are seperated based on their solubility product

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