Light Transmission through a Precipitate

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• Colour Change Method (image/png)

• Light shield

• Sodium thiosulfate and hydrochloric acid react in conical flask

• The transmission of light through the reaction mixture is measured using a datalogger and light sensor

• As the sulfur precipitate gradually forms, the solution becomes cloudier

• The amount of light transmitted is a measurement of the reaction's progression

• Measure and record the time taken for the light intensity to drop to a minimum value

• Calculate the rate of reaction by calculating 1/reaction time

• Light source transmits light through reaction mixture