An unknown solution may contain any of the seven cautions listed below. One stud

Question

An unknown solution may contain any of the seven cautions 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: On addition of 6 M HCI, a white precipitate results. The white precipitate is then mixed with NH_3 where it dissolves. When acidic H_2S is added to the unknown, a black precipitate results, and is dissolved in NH_3 giving a deep blue color. 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 Copper

Explanation / Answer

Silver - present

Since, Ag+ + HCl ----------> AgCl(white ppt) + NH3 ------------> [Ag(NH3)2]Cl ( Soluble )

Aluminium - absent

Barium - absent

Calcium - absent

Sodium - absent

Iron - absent

Copper - present

Cu2+ + H2S ----------> CuS(black ppt) + NH3 -------------> [Cu(NH3)2]^2+ ( soluble)

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