| This question is asking you to apply your knowledge of National 5 chemistry in a slightly unusual circumstance.
You should be able to recognise the functional group(s) on the citric acid molecule and which of those will react with sodium hydroxide.
You should be able to work out the molar relationship for the reaction of the functional groups with sodium hydroxide (from its chemical formula).
Taking into account these two piece of knowledge the question becomes relatively straightforward.
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