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The Rate Of Reaction Between Sodium Thiosulphate And Hydrochloric Acid At Different Concentrations

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Introduction

The Rate Of Reaction Between Sodium Thiosulphate And Hydrochloric Acid At Different Concentrations Plan I intend to investigate the reaction time between Hydrochloric Acid and Sodium Thiosulphate at different concentrations. Sodium + Hydrochloric Sodium + Sulphur + Sulphur Thiosulphate Acid Chloride Dioxide Na S O + HCl NaCl + H O + SO The experiments will be done under safe conditions, these are: I will be wearing goggles because chemicals are being used: all windows and doors will be open because sulphur dioxide is being produced. All stools and bags will be under the desks. I will get the chemicals one at a time for safety reasons. The apparatus I will be using are: 10cm measuring cylinder, 25cm measuring cylinder, 100cm measuring cylinder, 250cm conical flask, stop clock, Sodium Thiosulphate, Hydrochloric Acid, Water and a Piece of Paper. I will measure 40cm of water using the 100cm measuring cylinder and 10cm of sodium thiosulphate using the 10cm measuring cylinder. ...read more.

Middle

I will use the same piece of paper with a cross on it, so the cross is the same colour and shade. Apparatus 10cm measuring cylinder, 25cm measuring cylinder, 100cm measuring cylinder, 250cm conical flask, stop clock, Sodium Thiosulphate, Hydrochloric Acid, Water and a Piece of Paper. Method We measured 40cm of water using the 100cm measuring cylinder and 10cm of sodium thiosulphate using the 10cm measuring cylinder. We put them into the 250cm conical flask. We added 5cm hydrochloric acid using the 10cm measuring cylinder to the solution. We did the same for the 20cm sodium thiosulphate and 30cm water solution, the 30cm sodium thiosulphate and 20cm water solution, the 40cm sodium thiosulphate and 10cm water solution, and the 50cm sodium thiosulphate and 0cm water solution. We added 5 cm of hydrochloric acid to all of the solutions. We recorded the results below in the table. ...read more.

Conclusion

On the graph line C shows that when the concentration = 40cm Sodium Thiosulphate and 10cm water, the rate of reaction is 38 seconds. I found that when the volume of Sodium Thiosulphate in the solution doubles the rate of reaction does not. In fact it is close to half of the time. Evaluation The results indicate that the experiment was a sensible way to test the concentration of Sodium Thiosulphate has an influence in the role of a chemical reaction. The results obtained in the experiment were consistent and therefore reliable. However, having the Sodium Thiosulphate solution and the Hydrochloric Acid at the same temperature before the start of the experiment. This could have increased the accuracy of the results. We could have made the measurements of the volume of Sodium Thiosulphate, Water and Hydrochloric Acid more accurate by using Pipettes. We could have also used a light sensor to measure the degree of opaqueness of the cross to a better degree of accuracy. Ziggy Niblett Chemistry Coursework ...read more.

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