Drawing and naming the carboxylic acids
3 marks · EasyEthanoic acid is found in vinegar.
State the name of the main acid present in vinegar.
Write the molecular formula for ethanoic acid.
Give one everyday use of vinegar that depends on its acidic property.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Ethanoic acid
(b) C2H4O2
(c) Cleaning, salad dressing, food preservative, or any reasonable use involving acidity
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correctly states ethanoic acid as main acid in vinegar.
B2 (b) · 1 mark · Writes correct molecular formula C2H4O2.
B3 (c) · 1 mark · Gives one appropriate use of vinegar based on acidity, e.g., cleaning, as a preservative, etc.
Worked solution
a) Ethanoic acid is the main acid in vinegar.
b) The molecular formula for ethanoic acid is C2H4O2.
c) One everyday use of vinegar is cleaning surfaces (the acidity helps remove limescale), or it can be used in salad dressings, or as a preservative in pickles.