A student added some iron(II) carbonate powder to a boiling tube containing dilute sulfuric acid. She observed fizzing and the formation of a light green solution, W.
Identify the gas that causes the fizzing and describe a test for it.
Gas: Test:
Solution W contains sulfate ions.
The student confirmed this by adding some barium chloride solution. She observed a white precipitate of barium sulfate.
Give the formula of the white precipitate, and name the other solution she should have added before the barium chloride solution.
Formula of white precipitate: Other solution:
Complete the word equation for the reaction in this test.
iron sulfate+barium chloride→barium sulfate+————————————— \text{iron sulfate} + \text{barium chloride} \rightarrow \text{barium sulfate} + \text{—————————————} iron sulfate+barium chloride→barium sulfate+—————————————Solution W contains metal ions. The student wanted to confirm whether the ions were Fe2+\text{Fe}^{2+}Fe2+ or Fe3+\text{Fe}^{3+}Fe3+.
What reagent should she add to decide whether solution W contains Fe2+\text{Fe}^{2+}Fe2+ or Fe3+\text{Fe}^{3+}Fe3+ ions? State the result of the test in each case.
Reagent: Result with Fe2+\text{Fe}^{2+}Fe2+ ions: Result with Fe3+\text{Fe}^{3+}Fe3+ ions:
