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How does concentration affect the rate of reaction?  

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How does concentration affect the rate of reaction? In this piece of course work I will be investigating how the change in temperature will affect the rate of reaction of Sodium Thiosulphate with water and hydrochloric acid. The time will be recorded to see how long it takes for a pencil cross to disappear. The change in temperature will be observed as well as the reaction time with different temperatures. In my experiment I will alter the temperature but the concentration of sodium Thiosulphate and hydrochloric acid will be kept constant. Sodium Thiosulphate+Hydrochloric acid---Sodium Chloride+water+Sulpherdioxide+Suulpher Apparatus Hydrochloric acid Sodium Thiosulphate Digital Thermometer Distilled Water Paper with a cross Thermostatic Baths Flask Measuring Cylinder Stop Watch Pipette Fair Test To make all experiments a fair test we used the same amount of Hydrochloric acid through out the experiment (5cm3). We also used the same piece of paper with a drawn cross. We also used the same stopwatch through out the experiments. Hypothesis For this experiment...

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