GCSE AQA Chemistry Methods of Identifying Ions: This question is about chemical

Question

This question is about chemical analysis.

A student tested copper sulfate solution and calcium iodide solution using flame tests.

This is the method used.

1. Dip a metal wire in copper sulfate solution.
2. Put the metal wire in a blue Bunsen burner flame.
3. Record the flame colour produced.
4. Repeat steps 1 to 3 using the same metal wire but using calcium iodide solution.

What flame colour is produced by copper sulfate solution?

Calcium compounds produce an orange-red flame colour.

The student left out an important step before reusing the metal wire.

The student's method did not produce a distinct orange-red flame colour using calcium iodide solution. Explain why.

The student added sodium hydroxide solution to:

- copper sulfate solution
- calcium iodide solution.

Give the results of the tests.

Copper sulfate solution:

Calcium iodide solution:

To test for sulfate ions the student added dilute hydrochloric acid to copper sulfate solution.

Name the solution that would show the presence of sulfate ions when added to this mixture.

To test for iodide ions the student added dilute nitric acid to calcium iodide solution.

Name the solution that would show the presence of iodide ions when added to this mixture.
Give the result of the test.

This question is about chemical analysis - AQA - GCSE Chemistry - Question 1 - 2020 - Paper 2

Worked Solution & Example Answer:This question is about chemical analysis - AQA - GCSE Chemistry - Question 1 - 2020 - Paper 2

What flame colour is produced by copper sulfate solution?

Explain why.

Give the results of the tests.

Name the solution that would show the presence of sulfate ions when added to this mixture.

Name the solution that would show the presence of iodide ions when added to this mixture.

Give the result of the test.

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