Solid Y contains two cations (positive ions) and one anion (negative ion).
One of the cations is Cu2+\text{Cu}^{2+}Cu2+.
The table describes the tests carried out on an aqueous solution of Y and some of the observations made. Complete the table by giving the missing observation.
| Test | Observation |
|---|---|
| Add sodium hydroxide solution | [Missing Observation] |
| Then heat the mixture and test the gas given off with damp red litmus paper | Litmus paper turns blue |
| Add dilute nitric acid, then add a few drops of silver nitrate solution | White precipitate forms |
Which cation, other than Cu2+\text{Cu}^{2+}Cu2+, is present in Y? Explain your answer.
Identify the anion present in Y.
When magnesium is added to a solution containing Cu2+\text{Cu}^{2+}Cu2+ ions, a reaction occurs. The ionic equation for this reaction is:
Mg(s)+Cu2+(aq)→Mg2+(aq)+Cu(s) \text{Mg(s)} + \text{Cu}^{2+}(\text{aq}) \rightarrow \text{Mg}^{2+}(\text{aq}) + \text{Cu(s)} Mg(s)+Cu2+(aq)→Mg2+(aq)+Cu(s)Identify the reducing agent in this reaction and explain your choice.
35 exam-style questions on Edexcel IGCSE Chemistry Chemical tests. Each one has a worked solution and a mark scheme showing where the marks go.