A few drops of phenolphthalein indicator are added to dilute ethanoic acid - Edexcel - GCSE Chemistry - Question 5 - 2016 - Paper 1
Question 5
A few drops of phenolphthalein indicator are added to dilute ethanoic acid.
Choose the colour of this mixture.
Put a cross (✗) in the box next to your answer.
... show full transcript
Worked Solution & Example Answer:A few drops of phenolphthalein indicator are added to dilute ethanoic acid - Edexcel - GCSE Chemistry - Question 5 - 2016 - Paper 1
Step 1
Choose the colour of this mixture.
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Answer
The correct answer is A: colourless, as phenolphthalein indicator turns colourless in acidic conditions.
Step 2
Give the name of the type of reaction that occurs when ethanoic acid reacts with sodium hydroxide.
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Answer
The type of reaction is called neutralisation.
Step 3
Write the word equation for this reaction.
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Answer
The word equation is: ethanoic acid + sodium hydroxide → sodium ethanoate + water.
Step 4
State why vinegar is sprinkled on some foods.
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Answer
Vinegar is sprinkled on foods to flavour or improve their taste.
Step 5
State why other foods are stored in vinegar.
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Answer
Other foods are stored in vinegar to act as a preservative, preventing spoilage and killing bacteria.
Step 6
Describe how you would prepare a pure solution of magnesium ethanoate and how you would obtain pure, dry magnesium ethanoate crystals from that solution.
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Answer
To prepare a pure solution of magnesium ethanoate:
Mixing:
Put dilute ethanoic acid in a beaker.
Gradually add magnesium carbonate while stirring.
Continue adding until no more bubbles are observed, indicating complete reaction.
Filter the mixture to remove excess magnesium carbonate.
Making Crystals:
Heat the resulting magnesium ethanoate solution in an evaporating basin until it starts to evaporate.
Allow it to cool slowly so that crystals form.
Once crystals form, wash them with distilled water and dry them using absorbent paper.
