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Compounds are tested to see if they contain chloride, bromide or iodide ions - Edexcel - GCSE Chemistry - Question 3 - 2022 - Paper 1
Question 3
3
Compounds are tested to see if they contain chloride, bromide or iodide ions.
Figure 5 shows a flow chart of this test.
(a) (i) Describe how to make a solution... show full transcript
Worked Solution & Example Answer:3
Compounds are tested to see if they contain chloride, bromide or iodide ions - Edexcel - GCSE Chemistry - Question 3 - 2022 - Paper 1
Step 1
Describe how to make a solution from a solid in a test tube.
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Answer
To make a solution from a solid, start by adding a suitable solvent, such as water, to a test tube. Then, add a measured amount of the solid compound to the test tube. Shake or stir the mixture until the solid fully dissolves in the solvent.
Step 2
Give the name of the apparatus that should be used to add a few drops of silver nitrate solution to the test tube.
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The apparatus used to add a few drops of silver nitrate solution to the test tube is a pipette or dropper.
Step 3
When one compound is tested, a precipitate is seen. State what you see when a precipitate forms.
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Answer
When a precipitate forms, you will observe the formation of a solid that settles at the bottom of the test tube or appears as a cloudy suspension in the liquid.
Step 4
Using Figure 5, name the ion in the compound that causes a cream precipitate.
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Answer
The ion in the compound that causes a cream precipitate is the bromide ion.
Step 5
Using Figure 5, name the compound.
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Answer
The compound that forms a white precipitate is potassium chloride (KCl).
Step 6
Calculate the mass of the mixture at the end of the test.
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Answer
To calculate the mass of the mixture at the end of the test:
Initial mass of the solution = 10.0 g
Mass of dilute nitric acid = 1.0 g
Mass from silver nitrate solution = 4 imes 0.2 g = 0.8 g
Total mass = 10.0 g + 1.0 g + 0.8 g = 11.8 g
Therefore, the mass of the mixture at the end of the test is 11.8 g.
