This question is about some Group 7 compounds - AQA - A-Level Chemistry - Question 5 - 2019 - Paper 1
Question 5
This question is about some Group 7 compounds.
Solid sodium chloride reacts with concentrated sulfuric acid.
Give an equation for this reaction.
State the role of ... show full transcript
Worked Solution & Example Answer:This question is about some Group 7 compounds - AQA - A-Level Chemistry - Question 5 - 2019 - Paper 1
Step 1
Give an equation for this reaction.
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Answer
The reaction between solid sodium chloride (NaCl) and concentrated sulfuric acid (H₂SO₄) can be represented by the following equation:
NaCl+H2SO4→NaHSO4+HCl
Step 2
State the role of the sulfuric acid in this reaction.
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Answer
The role of sulfuric acid in this reaction is as a proton donor. It donates a proton to the chloride ion, facilitating the formation of hydrogen chloride gas.
Step 3
Give an equation.
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Answer
When sodium bromide (NaBr) reacts with concentrated sulfuric acid, the equation is as follows:
NaBr+H2SO4→NaHSO4+HBr
Step 4
Give one other observation.
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One observable change during this reaction is the production of brown fumes, which is indicative of the formation of sulfur dioxide (SO₂).
Step 5
State the role of the sulfuric acid.
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Answer
In this reaction, sulfuric acid acts as an oxidizing agent, allowing the bromide ion to be oxidized to bromine.
Step 6
Give the oxidation state of chlorine in NaClO, and in NaCl.
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In NaClO, the oxidation state of chlorine is +1. In NaCl, the oxidation state of chlorine is -1.
Step 7
State, in terms of redox, what happens to chlorine in the reaction 05.3.
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In the reaction, chlorine is both oxidized and reduced, participating in a disproportionation reaction.
Step 8
Give the formulas of D, E and F.
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Answer
The formulas are:
D = AgBr
E = AgCl
F = Ag(NH₃)₂Cl
Step 9
Give an ionic equation to show the formation of E.
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The ionic equation for the formation of silver chloride (AgCl) from silver ions (Ag⁺) and chloride ions (Cl⁻) is:
Ag+(aq)+Cl−(aq)→AgCl(s)
Step 10
Give an equation to show the conversion of D into G.
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Answer
The conversion of D (AgBr) into G can be represented by the following reaction:
