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# How does the concentration of Sodium Thiosulphate solution affect the rate of its reaction with Hydrochloric acid?

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Introduction

How does the concentration of Sodium Thiosulphate solution affect the rate of its reaction with Hydrochloric acid? Prediction I predict that the higher the concentration of Sodium Thiosulphate solution the quicker the rate of reaction with Hydrochloric acid will be. I think this because the collision theory says that a higher concentration means a larger number of particles in a given volume. If there are more particles, there will be more collisions. More collisions mean a larger number of successful collisions. Therefore the reaction rate will increase. low concentration high concentration Fair test To make my experiment a fair test I will keep the following variables the same: * The temperature of the Sodium Thiosulphate * The total volume of all the liquids when added together * The amount of Hydrochloric acid * The same cross * Always measure the level of liquid at the meniscus * Use the same person to measure out the liquid * Make sure the stopwatch is started when the Hydrochloric acid first hits the Sodium Thiosulphate solution * Use the same person ...read more.

Middle

The results were as follows Volume of acid (cm�) Volume of water (cm�) Time taken for the Magnesium to disappear (s) 50 0 9 40 10 21 30 20 58 20 30 96 10 40 523 The experiment shows that as the concentration increases, so does the rate of reaction. Results Volume of Sodium Thiosulphate (cm�) Volume of Water (cm�) Time (s) Repeat time (s) Repeat time (s) Average time (s) Rate 1/t (/s) 50 0 47 46 47 47 .0213 40 10 51 57 54 54 .0185 30 20 63 77 69 70 .0143 20 30 107 111 113 110 .0091 10 40 300 251 330 294 .0034 Observing patterns in results Looking at my results table, the average time graph and rate graph, I can see a clear pattern in the results. The average time graph shows a smooth, steady decreasing curve. This indicates the concentration of Sodium Thiosulphate increases the time taken for the reaction decreases. ...read more.

Conclusion

I would put a light sensor underneath the conical flask and connect it to a computer. This would tell me accurately when no more light was coming through the conical flask. I think my results were reasonably accurate because after doing two repeats I found the numbers around the same area. There were no results that were totally in the wrong place, instead there were a couple that were a few millimetres off the line of best fit on my rate graph. This could have happened because my experiment could have been more accurate if I had used light sensors and water baths. Other experiments that I could do to extend the work I have done is the effect of the concentration of acid on the rate of reaction with marble chips to see if I get similar findings or I could see how temperature effects the rate of reaction on the experiment I have just done by keeping the volume of Sodium Thiosulphate and Hydrochloric acid the same throughout the experiment and changing the temperature of one of them. ...read more.

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