An unknown solution may contain any of the seven cations listed below. One stude

Question

An unknown solution may contain any of the seven cations listed below. One student preformed a series of experiments to determine what ions are in the solution. Based upon the experiments performed by the students, the results are as follows:

a) On addition of 6 M HCl, a white precipitate results. The white precipitate is then mixed with NH3 where it dissolves.

b) When acidic H2S is added to the unknown, a black precipitate results, and is dissolved in NH3 giving a deep blue color.

c) When ammonium carbonate, concentrated ammonia, and ammonium chloride are added to the unknown, a clear solution results.

Classify the following ions as present, absent, or undetermined. (input the whole word)

Silver _____

Aluminium _____

Barium ______

Calcium _____

Sodium _____

Iron Blank _____

Copper Blank _____

Explanation / Answer

When adding HCl, you either form

AgCl, PbCl2, or HgCl2

since the options are

Silver _____

Aluminium _____

Barium ______

Calcium _____

Sodium _____

Iron Blank _____

Copper Blank _____

then choose Silver as the precipitrate

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

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