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Sodium Thiosulphate with hydrochloric acid.

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Science Investigation Joseph El-Hawary 10G Introduction: I will be conducting an experiment on the rate of reaction for my GCSE coursework. We will be reacting Sodium Thiosulphate with hydrochloric acid. I will be investigating the effects had on rate of reaction. When Sodium Thiosulphate and Hydrochloric are mixed, a yellow precept of Sulphur is produced. The solution becomes increasingly difficult to see through as more and more Sulphur is formed. Equipment: In order to conduct any type of experiment, The following Equipment is needed: Measuring cylinder (100cm3) Small measuring cylinder (50m3) Conical Flask 2 beakers Pad (marked with black cross) white cross Timer Sodium Thiosulphate Pipette Safety: To do this experiment the following safety precautions are needed. Goggles are needed to shield out eyes from any chemicals No running, distracting or dangerous behaviour, Hair tied back (if has long hair) and tie is kept away from chemicals. ...read more.


I will draw a table in my book for the results. I will use the Goggles to protect my eyes from chemicals I will draw a Large Black Cross on A piece of white paper. Place a Beaker over the cross. I will Get the two measuring cylinders and in the large, measure out 50cm3 of Sodium Thiosulphate. With the smaller measuring cylinder measure out 5cm3 of HCL (High Safety Needed Here) Mix the two Chemicals (Sodium Thiosulphate + Acid (HCL) in a beaker and start the timer. Once the cross has disappeared to the naked eye, stop the timer and record my results. I will do this process twice to get an average time. I will then do this several times for 40cm3 of Sodium Thiosulphate, 5cm3 of Acid (HCL) and 10 cm3 of Water, 30cm3 of Sodium Thiosulphate, 5cm3 of Acid (HCL) ...read more.


The fastest reaction made was with no water, 50 cm3 of Sodium Thiosulphate and 5 cm3 acid (HCL). This reaction is very fast with a time average of 33 seconds. The slowest reaction made was with 40 cm3 of water, 10 cm3 of Sodium Thiosulphate and 5-cm3 acid. This reaction was very slow with a time of 4 minutes in average. Improvements: The experiments were handled fairly but it could have been even fairer. Because the reaction was finished when the black cross on the paper disappeared and this is only seen by the naked eye. With the whole class doing this with different eye types, there is no exact fairness in the experiment. For Complete Fairness we could have used a device such as a light sensor or something similar. The light sensor will pass through the flask; if the light was not seen or had been broken up into many fragments then we would stop the experiment. This will make the experiment fairer. ...read more.

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