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 as:
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 that it acts as a proton donor (Bronsted-Lowry acid), donating protons to the chloride ions.
Step 3
For this reaction give an equation.
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Answer
When sodium bromide (NaBr) reacts with concentrated sulfuric acid, the equation is:
NaBr+H2SO4→NaHSO4+HBr
Step 4
Give one other observation.
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One other observation is the evolution of brown fumes of bromine gas (Br₂) during the reaction.
Step 5
State the role of the sulfuric acid.
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Answer
In this reaction, sulfuric acid serves as an oxidizing agent.
Step 6
Give the oxidation state of chlorine in NaClO, and in NaCl.
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Answer
In sodium hypochlorite (NaClO), the oxidation state of chlorine is +1. In sodium chloride (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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Answer
In this reaction, chlorine is oxidized and also reduced, undergoing disproportionation.
Step 8
Give the formulas of D, E and F.
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Answer
The formulas are as follows:
D: AgBr
E: AgCl
F: Ag(NH₃)₂Cl
Step 9
Give an ionic equation to show the formation of E.
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Answer
The ionic equation for the formation of silver chloride (E) from silver nitrate and hydrochloric acid 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 equation showing the conversion of silver bromide (D) into silver chloride (G) can be represented as:
