What is observed when concentrated hydrochloric acid is added to an aqueous solution of copper(II) sulfate until no further change occurs?
A pale blue precipitate forms that dissolves in excess concentrated hydrochloric acid to form a yellow-green solution.
The solution changes colour from pale blue to green/yellow-green and no precipitate forms.
A colourless gas is evolved and a green precipitate forms.
The solution remains pale blue and a white precipitate forms.
63 exam-style questions on AQA A Level Chemistry Transition metals (A-level only), covering General properties of transition metals (A-level only), Substitution reactions (A-level only), Shapes of complex ions (A-level only), Formation of coloured ions (A-level only), Variable oxidation states (A-level only), and Catalysts (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.