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-

1.List the cations whose chlorides are insoluble in water.

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

3. 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?

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

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

Explanation / Answer

1. Chloride of the cation Ag+ is insoluble in water.

   Chloride of the cation Hg22+ is insoluble in water.

   Chloride of the cation Pb+2 is insoluble in water.

   Chloride of the cation Cu+2 is insoluble in water.

   Chloride of the cation AS+3 is insoluble in water.

2.The anion may be SO4-2

3. the anion may be SO42-, CO32-, PO43-

4,Distillation, extraction, filtration or centrifugation

Centrifugation-In Centrifuges the centrifugal force is mechanically generated by turning the equipment containing the fluid in a circular path causing the fluids to separate. This method has been used in the laboratories and primitive industries for over a century. It has mainly been used to separate fluids in static state, i.e. ,specific volumes which needed to be separated

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