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Disappearing cross (aka Rate of reaction).

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  • Essay length: 2478 words
  • Submitted: 21/10/2003
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Science Coursework

Disappearing cross (aka Rate of reaction)

Introduction

This experiment is to investigate is two liquids, heated to an increasing temperature to see if it will make a reaction take place faster. The experiment I have used is the disappearing cross experiment, where two liquids, sodium thiosulphate and hydrochloric acid are mixed together and eventually the solution will become cloudy. I am going to investigate temperature in both of the liquids, heating them both to the optimum temperature before they are combined. The cross will be hand-drawn on paper and made water proof by covering it with sticky tape, due to it being underwater during the experiment. Once I have all the equipment in place I will mix the two liquids and measure the amount of time it takes for the solution to become cloudy. I will repeat this experiment 3 times to allow my results to be as accurate as possible. Each solution will have 10ml of sodium thiosulphate and 10ml of hydrochloric acid. The chemical reaction formula is: Na2S2O3 (aq) + 2HCL (aq) 2Nacl (aq) + H2O (l) + S (s) + SO2 (g).

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