6- Upon the addition of 6M HCl to solution containing cations from group I, Grou

Question

6- Upon the addition of 6M HCl to solution containing cations from group I, Group II, and Group III a white precipitate forms, what cations could be present?

A- Ag+ , Pb2+

B- Cu2+, Bi3+

C- Fe2+, Ni2+

7- You took the supernatant from the previous question and added 6M HCl to make the pH 0.5 and then added 10 drops of 1M thioacetamide and black brownish precipitate forms, what cations could be present?

A- Ag+ , Pb2+

B- Cu2+, Bi3+

C- Fe2+, Ni2

8 - You took the supernatant from question 7 and added enough 6M NH3 until the solution is alkaline to litmus paper. After it was alkaline to litmus paper you added 1M thioacetamide, heated the solution and centrifuged and a precipitate formed. What cations could be present?

A- Ag+, Pb2+

B- Cu2+, Cd2+

C- Fe2+, Ni2

Explanation / Answer

Ans 6 A) Ag+ , Pb2+

The cations that form white precipitate with HCl are Ag+ , Pb2+ and Hg22+ . They form insoluble white chlorides with HCl , out of which only silver chloride is readily soluble in NH3.

Related Questions

Navigate

• Browse (All)
• Browse 6
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.