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#Measure 10ml of 2[[Molarity|M]] [[Hydrochloric Acid]] using a [[Measuring Cylinder]].
#Add the 10ml of [[Hydrochloric Acid]] to the [[Conical Flask]] while starting a [[stopwatch]].
#Observe the cross from above, through the [[solution]]. When the cross is no longer [[visible]] through the [[solution]] stop the [[stopwatch]] and record the [[time]] in [[second]]s.
#Repeat the [[experiment]] with 20ml [[Sodium Thiosulphate]] and 30ml [[Water]], 30ml [[Sodium Thiosulphate]] and 20ml [[Water]], 40ml [[Sodium Thiosulphate]] and 10ml [[Water]] and 50ml [[Sodium Thiosulphate]].
#Repeat the same [[experiment]] for all [[ratio]]s of [[Sodium Thiosulphate]] and [[Water]] a further two times to calculate an [[Mean Average|average]].