Vinegar contains ethanoic acid.
(a) Which of these is a use of vinegar?
Put a cross (X) in the box next to your answer.
A fuel
B perfume
C preservative
D soap
(b... show full transcript
Worked Solution & Example Answer:Vinegar contains ethanoic acid - Edexcel - GCSE Chemistry - Question 1 - 2015 - Paper 1
Step 1
Which of these is a use of vinegar?
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Answer
The correct choice is C: preservative. Vinegar is commonly used as a preservative due to its acidity, which helps prevent the growth of bacteria and spoilage.
Step 2
An indicator can be used to show that ethanoic acid is acidic.
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Answer
An example of an indicator that can be used is phenolphthalein. In the presence of ethanoic acid, phenolphthalein appears colourless.
Step 3
If a bottle of wine is left open, ethanoic acid is formed when ethanol in the wine is oxidised by ________.
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Answer
oxygen.
Step 4
Ethanoic acid reacts with magnesium to give a gas. When the gas is mixed with air and ignited with a lighted splint, it gives a squeaky pop. This gas is ________.
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Answer
hydrogen.
Step 5
When sodium carbonate is added to dilute ethanoic acid, effervescence occurs. The effervescence is bubbles of ________.
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