(a) Insoluble salts are prepared by precipitation reactions - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1
Question 3
(a) Insoluble salts are prepared by precipitation reactions.
Lead nitrate solution reacts with potassium iodide solution to form a lead iodide precipitate and potas... show full transcript
Worked Solution & Example Answer:(a) 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 is lead iodide (C).
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
Two solid, soluble salts were used to make an insoluble salt in a precipitation reaction.
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The correct order of steps 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
Draw a line from each salt to the colour that it produces in flame test.
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Potassium salt produces a lilac colour.
Sodium salt produces a yellow colour.
Step 5
State the formula of potassium chloride.
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The formula of potassium chloride is KCl.
Step 6
Explain how a chlorine atom, Cl, forms a chloride ion, Cl⁻.
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A chlorine atom, Cl, forms a chloride ion, Cl⁻, by gaining one electron. This process results in a negatively charged ion because the number of electrons exceeds the number of protons, leading to an overall charge of -1.
