Chemistry help Watch

Kooldood
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Report Thread starter 12 years ago
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Method - 30cm3 sodium thiosulphate, Na2S2O3 is mixed with 5cm3 HCl in a conical flask containing 10cm3 H2O. The stopwatch is started until the cross on the paper underneath the flask disappears.

What are the measurement errors for this experiment?
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markkey
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Determining when the cross has actually disappeared this will vary depending how light the room is, how big the cross is and its contrast(larger cross probably visable for longer, black line on white visable for longer than a grey line on white).

General timing errors such as starting exactly when you have finished adding the thiosulphate. Then reaction errors which are usually pretty small on the overall timescale.
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