A student performs qualitative tests to identify a halide ion in an unknown aqueous solution. They first acidify the solution with dilute nitric acid and then add aqueous silver nitrate, which yields a cream-colored precipitate. This precipitate is insoluble in dilute aqueous ammonia but dissolves completely upon the addition of excess concentrated aqueous ammonia.
Which of the following options correctly identifies the halide ion in the sample, the chemical formula of the cream precipitate, and the formula of the coordination complex formed in the final solution?
Halide: Cl−\text{Cl}^-Cl−; Precipitate: AgCl(s)\text{AgCl}\text{(s)}AgCl(s); Complex: [Ag(NH3)2]+(aq)[\text{Ag}(\text{NH}_3)_2]^+\text{(aq)}[Ag(NH3)2]+(aq)
Halide: Br−\text{Br}^-Br−; Precipitate: AgBr(s)\text{AgBr}\text{(s)}AgBr(s); Complex: [Ag(NH3)4]2+(aq)[\text{Ag}(\text{NH}_3)_4]^{2+}\text{(aq)}[Ag(NH3)4]2+(aq)
Halide: Br−\text{Br}^-Br−; Precipitate: AgBr(s)\text{AgBr}\text{(s)}AgBr(s); Complex: [Ag(NH3)2]+(aq)[\text{Ag}(\text{NH}_3)_2]^+\text{(aq)}[Ag(NH3)2]+(aq)
Halide: Br−\text{Br}^-Br−; Precipitate: AgBr2(s)\text{AgBr}_2\text{(s)}AgBr2(s); Complex: [Ag(NH3)2]+(aq)[\text{Ag}(\text{NH}_3)_2]^+\text{(aq)}[Ag(NH3)2]+(aq)
41 exam-style questions on OCR GCSE Chemistry Identifying the products of chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.