Practical 21 The effect of catalysts GCSE

Practical 21 effect of catalysts :             HazCard : 95A, 55C, 27C, 25, 55B, 60

Apparatus & chemicals Each pupil/group needs : 

• 100 cm3 measuring cylinder 

• 100 cm3 beaker

• 50 cm3 measuring cylinder 

• stopwatch

• mat to work on

• paper with suitable black cross (drawn with Sharpie style pen)

 Chemicals : 

• 0.1 mol/dm3 sodium thiosulfate solution (250 cm3 per student) make 4L/class

• 0.1 mol/dm3 iron (III) nitrate solution (250 cm3 per student make 4L/class

• 0.1 mol/dm3 copper sulfate solution (20 cm3 per student)  100ml /class

• 0.1 mol/dm3 cobalt chloride solution (20 cm3 per student) 100ml/class (Not done with Mat2023)

• 0.1 mol/dm3 iron (II) sulfate solution (20 cm3 per student) 100ml/class

  • • • For the displacement practical you can make it up in water and add couple of cm³ of H2SO4, its just enough to keep it from oxidising for a couple of days but not enough to give a noticeable reaction with the metals.

• 0.1 mol/dm3 nickel (II) sulfate solution (20 cm3 per class) 100ml/class  (Not done with at 2023)

 Notes :

It is very important that the students do not cross contaminate the sodium thiosulfate and iron (III) nitrate solutions.  It is very important that the solutions are the correct concentration for this to work