Tests are carried out to identify the ions in two solids, P and Q - Edexcel - GCSE Chemistry - Question 4 - 2020 - Paper 1
Question 4
Tests are carried out to identify the ions in two solids, P and Q.
(a) A flame test is used to identify the metal ions in each of these solids.
(i) Describe how to... show full transcript
Worked Solution & Example Answer:Tests are carried out to identify the ions in two solids, P and Q - Edexcel - GCSE Chemistry - Question 4 - 2020 - Paper 1
Step 1
Describe how to do a flame test.
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Answer
To perform a flame test, first ensure that the metal is in solid form. Take a clean metal wire and dip it into the solid sample. Next, hold the wire in the flame of a Bunsen burner. Observe the color of the flame that is produced.
Step 2
Different metal ions produce different coloured flames.
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Answer
Draw one straight line from each metal ion to its flame colour:
Calcium → Yellow
Potassium → Lilac
Step 3
The anions in solutions of P and Q can be identified from the results of the tests shown in Figure 7.
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Answer
Draw one straight line from each solution to the anion present:
Solution of P → Bromide
Solution of Q → Chloride
Step 4
Give the total number of ions in the formula BaCl₂.
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Answer
The total number of ions in the formula BaCl₂ is 3 (1 barium ion and 2 chloride ions).
Step 5
State what would be seen.
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Answer
When sodium hydroxide is added to iron(II) sulfate, a green precipitate of iron(II) hydroxide will be formed, which will be observed in the solution.
Step 6
What is the name of this other product?
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Answer
The name of the other product formed in this reaction is water.
