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What affects the rate of reaction between Sodium thiosulphate and Hydrochloric acid?

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Introduction

What affects the rate of reaction between Sodium thiosulphate and Hydrochloric acid? Prediction I predict that the more concentrated the acid the faster the rate of reaction. Theory to back up my prediction Particle theory tells us that the more particles the more frequent successful collisions there will be. When the concentration of the acid is increased the rate of reaction increases because of more successful collisions. Low concentrated acid High concentrated acid Variables: Catalyst Concentration Temperature Plan In this experiment I am going to investigate what affects the rate of reaction between sodium thiosulphate and hydrochloric acid. A chemical reaction can only happen if the molecules frequently and successfully collide into each other. These molecules have to hit each other in the right direction and at the right speed and with the right amount of energy. Apparatus * 500ml Beaker * Stopwatch-- So I can accurately time the rate of a reaction to 1/100th of a second. ...read more.

Middle

Start timing when all the sodium thiosulphate has been poured into the beaker. 6. Wash the beaker thoroughly and repeat steps 2-5 another two times. 7. Repeat steps 2-5 with different with different hydrochloric acid molar strengths : Molar Strength Volume of Hyrochloric Acid in (ml) Amount of Water Added (ml) 2 50 0 1.60 40 10 1.20 30 20 1 25 25 0.80 20 30 Results Table Volume of Hydrochloric Acid 2 molar Volume of Sodium Thiosulphate Molar Strength of Hydrochloric Acid R.O.R Time (Sec) Water (ml) pure Average Total Volume Fair Test * I will use separate measuring cylinders for both chemicals so I don't contaminate either of them until I'm ready to time the reaction. * I will not use a catalyst in the experiment. * I will not increase the temperature of the liquids, and the area which I shall be working in will be kept constant at room temperature(22oC) ...read more.

Conclusion

Looking at graph A you can see that there is a positive correlation between the concentration of hydrochloric acid and the reaction rate. When hydrochloric acid and thiosulphate react together the sulphur is stronger of the two. This means that as the reaction goes on the solution becomes yellow and will change from being transparent to translucent to opaque. The more concentrated the acid the more particles there are which means the more collisions. On my graph, the line of best fit shows that the time taken for the reaction between hydrochloric acid and sodium thiosulphate is proportional to the concentration of the hydrochloric acid. Evaluation I think that my results were fairly accurate, as there wasn't any anomalous points. If I were to repeat this experiments I think that I could improve my results even more by * I don't think there was a large enough range of results taken so I would Increase the number of experiments another twice for each category * Repeat experiment but with a different person to judge when the reaction has finished. ...read more.

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