Edexcel Jun 2017 Paper 5 Q19

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19 Crystals of methyl 3-nitrobenzoate can be prepared by nitration of methyl benzoate. The reaction is carried out in a flask surrounded by ice, and the product is purified by recrystallization from ethanol. O N+ CH3 CH3 D O N O T W R I T E I N T H I S A R E A methyl benzoate Molar mass = 136 g mol1 methyl 3-nitrobenzoate Molar mass = 181 g mol1 (a) In this preparation, 2.00 g of methyl benzoate produced 1.50 g of methyl 3-nitrobenzoate. The percentage yield is A 82.9 B 75.0 C 56.4 D 15.0 (b) In the recrystallization step, the highest yield will be obtained when A using excess ethanol to dissolve the crude solid. B heating the ethanol to 20 C below its boiling temperature. C slowly filtering the hot mixture to remove insoluble impurities. D crystallizing the filtrate using an ice bath. (1) (1) D O N O T W R I T E I N T H I S A R E A (Total for Question 19 = 2 marks) TOTAL FOR SECTION A = 20 MARKS *P48070A0828* D O N O T W R I T E I N T H I S A R E A<br /> A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D BLANK PAGE A E R A S I H T N I E T I R W T O N O D *P48070A0928* Turn over<br />

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