This question is about qualitative chemical analysis.
An analyst investigated calcium bromide solution and potassium sulfate solution using flame tests and precipitation reactions.
This is the method used for the flame tests:
What flame colour is produced by calcium bromide solution?
Potassium compounds produce a lilac flame colour. The analyst did not clean the wire before reusing it for the potassium sulfate test. As a result, the analyst’s second flame test did not produce a distinct lilac flame colour. Explain why.
The analyst added sodium hydroxide solution to:
Give the observation for each of these tests.
To test for bromide ions, the analyst added dilute nitric acid to calcium bromide solution. Name the solution that would show the presence of bromide ions when added to this mixture.
To test for sulfate ions, the analyst added dilute hydrochloric acid to potassium sulfate solution. Name the solution that would show the presence of sulfate ions when added to this mixture, and give the observation that confirms their presence.