Insoluble salts are prepared by precipitation reactions - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1
Question 3
Insoluble salts are prepared by precipitation reactions.
Lead nitrate solution reacts with potassium iodide solution to form a lead iodide precipitate and potassium ... show full transcript
Worked Solution & Example Answer:Insoluble salts are prepared by precipitation reactions - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1
Step 1
What is the name of the insoluble salt?
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Answer
The name of the insoluble salt formed from the reaction between lead nitrate and potassium iodide is lead iodide.
Step 2
Write the word equation for the reaction.
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Answer
The word equation for the reaction is:
lead nitrate + potassium iodide → lead iodide + potassium nitrate.
Step 3
Put the steps in the correct order.
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Answer
The correct order of steps to make the insoluble salt is:
B - dissolve each of the soluble salts in water.
E - mix the solutions together.
A - filter the mixture.
D - wash the solid with distilled water.
C - put in an oven to dry.
Step 4
State the formula of potassium chloride.
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Answer
The formula of potassium chloride is KCl.
Step 5
Explain how a chlorine atom, Cl, forms a chloride ion, Cl⁻.
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A chlorine atom, Cl, has seven electrons in its outer shell. To achieve the stable electronic configuration of a noble gas, it needs to gain one electron. When it gains this electron, it becomes a chloride ion, Cl⁻, which has a negative charge.
