3. 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 f... 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 in a test tube, first, add an appropriate solvent, usually water, to the test tube. Next, add the solid compound to the solvent. Finally, shake or stir the mixture thoroughly until the solid has completely dissolved.
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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Answer
A pipette or dropper can be used to add a few drops of silver nitrate solution to the test tube.
Step 3
When an equation is written for this reaction, which state symbol is used for the silver nitrate solution?
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The state symbol used for the silver nitrate solution is (aq), indicating that it is an aqueous solution.
Step 4
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 a solid that appears in the mixture, separating from the liquid, often resulting in a cloudy or milky appearance.
Step 5
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 6
Using Figure 5, name the compound.
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Answer
The compound that forms a white precipitate is potassium chloride.
Step 7
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, add the mass of the solution with the mass of the added components:
Initial mass of potassium compound solution = 10.0g
Mass of dilute nitric acid = 1.0g
Mass of silver nitrate added = 4 drops × 0.2g/drop = 0.8g
Total mass = 10.0g + 1.0g + 0.8g = 11.8g.
Therefore, the mass of the mixture at the end of the test is 11.8g.
