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The Disappearing Cross
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| Submitted: Sun Dec 15 2002
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The Disappearing Cross In this experiment, we shall be adding sodium thiosulphate to hydrochloric acid together and placing a drawn cross underneath and seeing how long the rate of reaction lasts until you cannot see this cross. Before the reaction starts, the liquids are both clear. When added they turn cloudy and milky with a yellow tinge to it, due to the sulphur released. Na2S203 (aq) + 2HCL --> 2Nacl (aq) + H20 (l) + SO2 (g) + S(s) Sodium thiosulphate + hydrochloric acid --> sodium chloride + water + sulphur dioxide + Sulphur The aim of this experiment is to see how each factor affects the rate of reaction. The factors we are concentrating on are: * Concentration * Surface area/Particle size * Temperature * Catalyst Collision Theory: In order to understand rates of reactions, we use this model 1) All chemicals are made from particles (atoms/Molecules) 2) The particles have energy and can move 3) Chemical reactions only happen when...
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