3. In an \"unknown\" solution only one of the following cations is present: Ag\'
ID: 1084831 • Letter: 3
Question
3. In an "unknown" solution only one of the following cations is present: Ag', Ba", Mg", or Cu". The following experimental data was collected: Ag' Ba2* Mg* Cu2* NH,(aq) No change No change White ppt Blue ppt/deep blue HCl(aq) White ppt No change No change H2SO,(aq) No change White ppt No change No change No change solution with excess a. Write the formula of the insoluble silver salt. b. Write the formula of the insoluble barium salt. From the data, devise a procedure that could be used to identify a specific cation in solution.Explanation / Answer
(a)
AgCl
Ag+ (aq.) + HCl (aq.) ---------------> AgCl (s) + H+ (aq.)
(b)
BaSO4
Ba2+ (aq.) + H2SO4 (aq.) --------------> BaSO4 (s) + 2 H+ (aq.)
(c)
(i)
To the unknown solution add NH3 solution if you get white precipitate it indicates presence of Mg2+ ions in the unknown.
(ii)
To the unknown solution add NH3 solution you get a blue precipitate or blue solution it indicates the presence of Cu2+ ion in the unknown solution.
(iii)
To the inknown solution add HCl solution if you get a white precitate it indicates the presence of Ag+ ion in the unknown solution.
(iv)
To the unknown solution add H2SO4 solution if you get a white precipitate it indicates the presence of Ba2+ ion in the unknown.
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