This question is about salts - AQA - GCSE Chemistry - Question 5 - 2021 - Paper 1
Question 5
This question is about salts.
Name the salt produced by the neutralisation of hydrochloric acid with potassium hydroxide.
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Write an ionic equ... show full transcript
Worked Solution & Example Answer:This question is about salts - AQA - GCSE Chemistry - Question 5 - 2021 - Paper 1
Step 1
Name the salt produced by the neutralisation of hydrochloric acid with potassium hydroxide.
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Answer
The salt produced is potassium chloride, commonly abbreviated as KCl.
Step 2
Write an ionic equation for the neutralisation of hydrochloric acid with potassium hydroxide.
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Answer
The ionic equation for the neutralisation is:
H++OH−→H2O
Step 3
Which of these insoluble solids can be used to make a copper salt by reacting the solid with dilute hydrochloric acid?
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Answer
The correct choice is 'Copper carbonate and copper oxide only'.
Step 4
Give one reason for: step 2
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Answer
In step 2, warming the sulfuric acid is done to speed up the reaction rate between sulfuric acid and magnesium oxide.
Step 5
Give one reason for: step 5
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Answer
In step 5, this step ensures that all the hydrochloric acid reacts with the magnesium oxide to form magnesium sulfate.
Step 6
Give one reason for: step 6
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Answer
In step 6, filtering the mixture is necessary to remove any excess magnesium oxide from the solution.
Step 7
How should the filtrate be evaporated gently in step 7?
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The filtrate should be evaporated gently using a boiling water bath or an electric heater to avoid overheating and breaking the crystals.
Step 8
Calculate the volume of chlorine needed to react with 14 g of iron.
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Answer
To calculate the volume of chlorine needed, first determine the moles of iron:
extmolesFe=56extg/mol14extg=0.25extmol
From the balanced equation:
2extFe+3extCl2→2extFeCl3
Thus, for 0.25 moles of Fe:
extmolesCl2=23×0.25=0.375extmol
Finally, calculate the volume of chlorine gas needed:
extvolumeCl2=24extdm3imes0.375=9.0extdm3
