This question is about sodium halides - AQA - A-Level Chemistry - Question 9 - 2020 - Paper 1
Question 9
This question is about sodium halides.
1. State what is observed when silver nitrate solution is added to sodium fluoride solution.
2. State one observation when s... show full transcript
Worked Solution & Example Answer:This question is about sodium halides - AQA - A-Level Chemistry - Question 9 - 2020 - Paper 1
Step 1
State what is observed when silver nitrate solution is added to sodium fluoride solution.
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Answer
When silver nitrate solution is added to sodium fluoride solution, a colorless solution is observed, indicating no precipitate formation.
Step 2
State one observation when solid sodium chloride reacts with concentrated sulfuric acid.
Give an equation for the reaction.
State the role of the chloride ions in the reaction.
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Answer
Observation: White fumes of hydrogen chloride gas are produced.
Equation:
ightarrow Na_2SO_4 + 2HCl $$
Role: The chloride ions act as a base, accepting protons from sulfuric acid.
Step 3
Give an equation for the redox reaction between solid sodium bromide and concentrated sulfuric acid.
Explain, using oxidation states, why this is a redox reaction.
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Equation:
ightarrow Na_2SO_4 + Br_2 + H_2O $$
Explanation: In this reaction, bromine (Br) is oxidized from an oxidation state of -1 in NaBr to 0 in Br2, while sulfur (S) is reduced from an oxidation state of +6 in H2SO4 to +4 in Na2SO4.
Step 4
State what is observed when aqueous chlorine is added to sodium bromide solution.
Give an ionic equation for the reaction.
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Answer
Observation: A yellow or orange solution is formed.
