Identify the mystery substances

This task is about testing with different solutions to identify four solid substances.
Part A
Set up a spotting tile with a small amount of each solid as indicated by the key.
 
Row A
 
Row B
 
Row C
      
 
Add 3 drops of the following solutions to the solids in each row and then write down the changes you see.
 
i) 
ii) 
iii)
To row A add dilute hydrochloric acid.
To row B add iodine solution.
To row C add universal indicator solution.
 
a)
Record your observations in the table below.
 
 
  Bicarbonate of soda Cornflour Sherbet Sugar
Hydrochloric acid
 
 
      
Iodine solution
 
 
      
Universal indicator
 
 
      
 
 
Part B

  • Use your observations from part A to identify the unknown solids labelled W, X, Y, and Z. The solids could be bicarbonate of soda, cornflour, sherbet, sugar, or a mixture of two of these solids.
  • Set up your spotting tile as before, with unknown solids W, X, Y, and, Z in each column.
  • Add 3 drops of dilute hydrochloric acid to Row A, 3 drops of iodine solution to row B, and 3 drops of universal indicator solution to Row C.
a) Record your observations in the table below.
 
  W X Y Z
Hydrochloric acid
 
 
      
Iodine solution
 
 
      
Universal indicator
 
 
      
 
b)
 
 
On the basis of your tests, identify the solids in the substances W, X, Y, and Z.
 

 
Substance W: ______________________________
 
Substance X: ______________________________
 
Substance Y: ______________________________
 
Substance Z: ______________________________