(a(i))[3]
The student correctly concludes that ammonia is formed in test 1. Describe what else the student needed to do to arrive at this conclusion.
(a(ii))[1]
State why the student cannot identify the anion in W from the result in test 3.
(a(iii))[1]
State how the tests and observations demonstrate that W does not contain sodium ions.
(a(iv))[2]
Identify the cation and the anion present in W.
(b(i))[1]
The student adds dilute hydrochloric acid to copper(II) carbonate. A gas and a solution are formed. State the observation that shows a gas has been produced.
(b(ii))[3]
Describe one way to carry out a flame test to confirm the presence of copper(II) ions in the solution.
(b(iii))[3]
Describe another method the student could use to confirm that the solution contains copper(II) ions.