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.
A co... 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 option is A, which indicates that the mixture is colourless when phenolphthalein is added to dilute ethanoic acid.
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 reaction that occurs is known as neutralisation.
Step 3
Write the word equation for this reaction.
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Answer
The word equation for the reaction between ethanoic acid and sodium hydroxide 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 some foods to enhance their flavour.
Step 5
State why other foods are stored in vinegar.
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Answer
Other foods are stored in vinegar as a preservative, helping to prevent spoilage and kill 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 from dilute ethanoic acid and magnesium carbonate, follow these steps:
Mixing: Put dilute ethanoic acid in a beaker and gradually add magnesium carbonate while stirring to ensure complete reaction. Continue adding until no further effervescence occurs.
Filtration: Filter the mixture using filter paper and a funnel to remove any excess magnesium carbonate residue.
Evaporation: Heat the solution in an evaporating basin to evaporate some of the water, allowing magnesium ethanoate to crystallize as the solution cools.
Collection: Once crystallization occurs, collect the crystals and wash them gently with cold water, then dry them using absorbent paper.
