Drawing and naming esters
2 marks · HardDescribe, using the names of the compounds, what is removed from ethanol and ethanoic acid during formation of ethyl ethanoate.
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A hydrogen from the ethanol and a hydroxyl group (OH) from the ethanoic acid are removed to form water.
Also accept: An H atom from the alcohol and an OH group from the acid combine to form H2O.; Hydrogen from ethanol and hydroxyl from ethanoic acid are removed.
Common mistakes: Saying that two hydrogen atoms are removed; Not naming both ethanol and ethanoic acid
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Marking points
B1 · 1 mark · Identifies removal of H from ethanol (alcohol) or from the alcohol.
B2 · 1 mark · Identifies removal of OH from ethanoic acid (acid) or from the acid.
Worked solution
In ester formation, a hydrogen atom is removed from the ethanol (alcohol), and a hydroxyl group (OH) is removed from ethanoic acid (acid). These combine to form water.