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Chemical tests are used to identify gases, anions and cations - OCR Gateway - GCSE Chemistry - Question 16 - 2019 - Paper 2
Question 16
Chemical tests are used to identify gases, anions and cations. (a) Draw lines to match the gas to the correct chemical test. gas chemical test car... show full transcript
Worked Solution & Example Answer:Chemical tests are used to identify gases, anions and cations - OCR Gateway - GCSE Chemistry - Question 16 - 2019 - Paper 2
Step 1
Step 2
Describe how she should do a flame test.
Answer
To perform a flame test, she should take the following steps:
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Preparation: Ensure that all necessary materials are ready, including a clean platinum wire or a clean wooden splint. The splint should be dipped into the sample solid to be tested.
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Cleaning the Wire: If using a platinum wire, it should be cleaned in hydrochloric acid and then heated in a Bunsen burner flame until no color is imparted to the flame.
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Testing the Sample: Dip the clean wire or splint into the solid sample and then place it in the edge of a Bunsen burner flame.
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Observing the Color: Observe the color of the flame produced. Certain cations will produce specific colors, which help determine the identity of the cation.
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Safety Precautions: Always wear safety goggles and work in a well-ventilated area to avoid inhaling any harmful fumes.