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#Draw a large thick black cross on to a [[White Tile]] and place a 100ml [[Conical Flask]] on top as shown in the [[diagram]].
#Measure 10ml of 0.25[[Molarity|M]] [[Sodium Thiosulphate]] using a [[Measuring Cylinder]] and add to the [[Conical Flask]].
#Measure 40ml of [[Water]] and add to the [[Conical Flask]].
#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]].
====Observation of Rate by Gas Produced====