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Rate of Reaction

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Title: Rate of Reaction

Essay Details:

Subject: Science

Author: Valerie W

Date: April 6, 2013

Level: University

Grade: A

Length: 3 / 890

Essay text:

The ionic formula for the reaction is as follows: S2O82- (aq) + 2I- (aq) > 2SO42- (aq) + I2 (aq) However, in order to measure the rates of reaction, sodium thiosulphate and starch are added. Sodium thiosulphate is added to react with a certain amount of iodine as it is made. Without the thiosulphate, the solution would turn blue/black immediately, due to the iodine and starch. The thiosulphate ions allow the rate of reaction to be determined by delaying the reaction so that it is practical to measure the time it takes for the iodine to react with the thiosulphate. After the all the thiosulphate has reacted with the iodine, the free iodine displays a dark blue/black colour with the starch...

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