page 12 22. The structural formula of malic acid is shown below. OH O O OH HO How many moles of sodium carbonate, Na2CO3, would be required to neutralise 6.7 g of malic acid (GFM = 134 g)? A 0.050 B 0.075 C 0.10 D 0.15 23. A student carried out a gravimetric analysis by heating a 2.52 g sample of hydrated calcium chloride, CaCl2·2H2O, until it reached constant mass. What was the mass of the calcium chloride sample after heating to constant mass? A 1.70 g B 1.90 g C 2.11 g D 2.21 g 24. Which of the following techniques can be used to both purify and identify a compound? A Distillation B Recrystallisation C Solvent extraction D Melting point determination
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This question is part of the UK A-Level Chemistry syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
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