Figure 3 shows two tests carried out on a white solid and the results of the tests - Edexcel - GCSE Chemistry - Question 2 - 2018 - Paper 1
Question 2
Figure 3 shows two tests carried out on a white solid and the results of the tests.
| test | results |
| --- | --- |
| test 1 | flame test carried out | a yellow fl... show full transcript
Worked Solution & Example Answer:Figure 3 shows two tests carried out on a white solid and the results of the tests - Edexcel - GCSE Chemistry - Question 2 - 2018 - Paper 1
Step 1
Which ion is shown to be present by the result of test 1?
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Answer
The yellow flame produced in test 1 indicates the presence of sodium ions. Sodium compounds produce a characteristic yellow flame when tested.
Step 2
State the name of the gas given off in test 2.
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Answer
The gas given off in test 2 is carbon dioxide (CO₂). This gas is known to produce effervescence when dilute hydrochloric acid is added to carbonates.
Step 3
State the name of the ion shown to be present in the white solid by the result of test 2.
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Answer
The ion that is shown to be present in the white solid by the result of test 2 is the carbonate ion (CO₃²⁻). The presence of carbon dioxide confirms this.
