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===Method===
====Observation of Rate by Colour Change[[Opacity]]===={| class="wikitable"|-|[[File:MeasuringOpacity.png|center|200px]]|}#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====
{| class="wikitable"
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|[[File:MeasuringGasGivenOff.png|center|400px]]
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| style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows a possible setup for [[measuring]] the [[gas]] given off during an [[experiment]].
|}
#Set up the [[apparatus]] as shown in the [[diagram]].
#Measure 10ml 2[[Molarity|M]] [[Hydrochloric Acid]] using a [[Measuring Cylinder]].
#Add the [[Hydrochloric Acid]] to the [[Boiling Tube]].
#Add 1 [[spatula]] of Marble chips [[Calcium Carbonate]] to the [[Boiling Tube]].
#Attach the bung.
#Fill the 50ml [[Measuring Cylinder]] with [[water]] in the tub and hold it over the end of the [[Delivery Tube|delivery tube]] to collect the bubbles.
#Start a [[stopwatch]] and record the [[Volume (Space)|volume]] of [[gas]] in the [[Measuring Cylinder]] every 10 seconds.
#Repeat this [[experiment]] with 10ml 1[[Molarity|M]] [[Hydrochloric Acid]].