Drawing and naming the carboxylic acids
2 marks · HardDraw the structural formula for butanoic acid and state the total number of hydrogen atoms in one molecule.
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.
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Must show: CH3CH2CH2COOH for butanoic acid
Also accept: structural formula written as CH3CH2CH2COOH and correct hydrogen count
Common mistakes: forgetting one –CH2– group; miscounting hydrogens
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Marking points
A1 · 1 mark · Correct structural formula: CH3CH2CH2COOH
A2 · 1 mark · Correct count of hydrogen atoms: 8
Worked solution
The structural formula of butanoic acid is CH3CH2CH2COOH. There are a total of 8 hydrogen atoms in one molecule.