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Investigating the reaction between sodium Thiosulphate and hydrochloric acid.

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Introduction

Investigating the reaction between sodium Thiosulphate and hydrochloric acid Aim How the rate could be changed so enough sulphur has been formed so you can no longer see through the liquid. Information I already know When the two chemicals (sodium Thiosulphate and hydrochloric acid) are mixed together the liquid goes cloudy so you can no longer see through it. Preliminary experiment As there are two ways I could investigate this reaction, by temperature or by concentration, I had to decide which one would be most suitable. I have decided to choose to test the reaction by changing the concentration of hydrochloric acid. I will change the concentration four times first starting with 0.5m of HCl then 1.0m, 1.5m and finally 2m. Safety I will need to take safety precautions such as using goggles at all times whitest doing the experiment. ...read more.

Middle

I will then time how long until I can no longer see the cross through it. Once I cannot see the cross I will stop the stopwatch and take the time down. I will then wash out both of the beakers and do the same but changing the concentration of the HCl to 1.0m then 1.5 and finally 2.0m. Prediction What I predict to happen is that as I increase the concentration of HCl the faster it will take for the reaction to take place. I have predicted this due to my knowledge of the collision theory. The collisions theory is based on the assumption that it is necessary for a reaction to take place by the molecules in each chemical to collide with one another. Which means that if I increase the concentration of HCl there with be more molecules of HCl to collide with the molecule in the sodium Thiosulphate, therefore making the reaction faster. ...read more.

Conclusion

My method of this experiment was roughly accurate. I made sure that I washed the beakers out before moving on to the next part of the experiment. I measured out the same amount of sodium Thiosulphate and I only changed the concentration of the HCl. If I were to redo this experiment I would use four different sets of beakers for the different concentrations. This would give me more accurate results. I would also do more different ranges of concentration so that I had a bigger range of results to analyses. I could also extend my investigation by not only investigating how the concentration effects the reaction time but by also investigating how temperature effects the rate of reaction. As the collisions theory states that the particles have to collide with one another to create a reaction. The increase of heat effects how the fast the particles travel around, so the more the temperature is increased the faster the particles more around increasing the risk of collision. ...read more.

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