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# The effect of concentration of sodium thiosulphate on the reaction between hydrochloric acid and sodium thiosulphate.

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Introduction

The effect of concentration of sodium thiosulphate on the reaction between hydrochloric acid and sodium thiosulphate Aim: With the knowledge from our preliminary experiment, I will be trying to find out the rate of reaction between the two chemicals. We are investigating whether the effect of concentration of sodium thiosulphate will change the rate of reaction. I want to make it a fair test so it will be better for the accuracy of my future results, I think if I do a fair test it will be reflected in my results. A fair test will be done to make sure that I do not mix any of the chemicals together and accurately measure amounts of chemicals used. I will also try to keep out as many factors, which are avoidable, but inevitably there will be things, which I cannot avoid, I will try to keep the test constant, as it will make it even more fairer. Apparatus: Flask, measuring cylinder, paper labelled with an, 'X', stirring rod, stop-clock, safety mat, and safety goggles. ...read more.

Middle

I will also calculate the reaction rate, by using the formula of 1/time. After that I will plot a graph to show how the rate of reaction varies with the concentration of the sodium thiosulphate solution. The graph will have the reaction rate on the y-axis and the concentration on the x-axis. Conclusion The graphs show that the higher the concentration of sodium thiosulphate solution, the quicker the reaction rate was. In my experiment, I proved this in my results. When I started with a very high concentration of sodium thiosulphate solution, the reaction rate was very quick but when the concentration went down so did the speed of the reaction rate. The effect of the amount of water added to the solution proved to be of great significance. As I kept adding water to the solution it brought down the reaction rate quite hugely. The adding of the water makes the solution a lot more diluted, which means it is a lot less concentrated. ...read more.

Conclusion

So little chemical spillages and mixes are quite hard to avoid. Anomalous results could have happened due to these problems but luckily there wasn't any in my results, which is clearly shown by the shape of the graph. Poor measurements of chemicals were one of the problems that I encountered quite frequently. If we used a pipette in the experiment it would have been much easier as overfilling in flasks can happen when you pour it into flasks, as it is hard to control the flow. But if we used a pipette it would have been so much easier as you can put a drop in at a time, this is far more accurate and is quicker. The starting and the stopping of the clock was crucial as well because if you started it that little bit too late or too early the results would have been inaccurate. But as you have to judge for yourself as to when the reaction is finished or not, it could be wrong due to safety goggles being dirty or if you have bad eyesight, it is your own opinion, so it's your decision. 1 James Fitzgerald ...read more.

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