Compound C is a pink crystalline solid containing two cations and one anion.
Three tests were carried out on C. The observation made for each test was recorded in the table.
(6)
Test | Observation | Inference |
Test 1 Aqueous sodium hydroxide was added to solid C and the mixture warmed The gas evolved was tested with damp red litmus paper |
The red litmus paper turned blue | The gas evolved was .................... One of the cations in C is .................... |
Test 2 |
The pink solution turned blue |
The other cation in C is .................... |
Test 3 Dilute hydrochloric acid and aqueous barium chloride were added to an aqueous solution of C |
A white precipitate formed |
The white precipitate is .................... |
Do not include water of crystallisation.
(1)
Write the ionic equation for the reaction between the cation in C and sodium hydroxide producing the gas in Test 1.
State symbols are not required.
State the type of reaction occurring in Test 2.
Give a reason why dilute hydrochloric acid is needed in Test 3.
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