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 insoluble salt formed in this reaction is lead iodide, which is option C. This salt is often formed in precipitation reactions due to the low solubility of lead iodide in water.
Step 2
Write the word equation for the reaction.
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Answer
The word equation for the reaction between lead nitrate and potassium iodide 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 create the insoluble salt is as follows:
Dissolve each of the soluble salts in water (B).
Mix the solutions together (E).
Filter the mixture (A).
Wash the solid with distilled water (D).
Put in an oven to dry (C).
Step 4
State the formula of potassium chloride.
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The formula of potassium chloride is KCl, which represents one potassium ion (K⁺) and one chloride ion (Cl⁻).
Step 5
Explain how a chlorine atom, Cl, forms a chloride ion, Cl⁻.
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A chlorine atom forms a chloride ion by gaining one electron, which gives it a negative charge. This process occurs because chlorine has seven electrons in its outer shell and seeks to achieve a stable octet configuration, which is accomplished by gaining an electron.
