Edexcel Jan 2017 (IAL) Paper 1 Q22

Answers available below

22 This question is about a preparation of hydrated zinc sulfate crystals. An excess of powdered zinc is added to 20 cm3 of 1.00 mol dm3 sulfuric acid. (a) (i) State two observations you would make during this reaction. (2)(ii) Write the ionic equation for this reaction. Include state symbols. (2) *(b) When the reaction is complete, a solution of zinc sulfate is formed. Some unreacted zinc is left. Describe how pure dry crystals of hydrated zinc sulfate may be obtained from this mixture. (4)12 *P48367A01224* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br /> (c) (i) The formula of the hydrated zinc sulfate crystals is ZnSO4.7H2O. Calculate the molar mass of ZnSO4.7H2O. (ii) Calculate the number of moles of sulfuric acid in 20.0 cm3 of a 1.0 mol dm3 solution. (iii) 4.00 g of hydrated zinc sulfate crystals form. Calculate the percentage yield of hydrated zinc sulfate. Give your answer to two significant figures. (1) (1) (2) (Total for Question 22 = 12 marks) 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 A E R A S I H T N I E T I R W T O N O D *P48367A01324* 13 Turn over<br />

Show answer