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What affects how quickly sodium thiosulphate solution goes cloudy?
Member rating: No Rating | Words: | Submitted: Mon Mar 08 2004
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Tuesday, 12 November 2002 Candidate Number: Ilford County High School CHEMISTRY SCIENCE 1 INVESTIGATION What affects how quickly sodium thiosulphate solution goes cloudy? When an amount of acid is added to a solution of sodium thiosulphate, the mixture reacts. As a precipitate forms, the mixture turns from being translucent into a cloudy, yellow colour. This reaction can be timed quite easily, by measuring how long it takes the precipitate to make the mixture opaque. The equation for this reaction is: S2O32-(aq) + 2H+(aq) --> H2O + SO2(g) + S(s) Several factors could be changed to either accelerate or slow down the speed of the reaction. These are: 1. Temperature. The particles in both the acid and thiosulphate will begin to move more quickly, thereby causing more collisions (as the particles have increased their speed, the rate at which they collide also increases) with more energy. 2. Concentration. Since there are more particles present in the mixture, there is...
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