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# An investigation to see how concentration affects the rate of reaction.

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Introduction

An investigation to see how concentration affects the rate of reaction. Aim: To see by varying the concentration of sodium thiosulphate affects how fast the cross disappears. Diagram: Method: First set up the equipment, take all safety precautions. For the first one do the more concentration then gradually to the least concentration. First put the 25cm3 of sodium thiosulphate in a measuring cylinder then put it into a empty beaker then put in 5cm3 of hydrochloric acid into the same beaker, start the stop clock and wait for the cross to disappear. When you do the less concentrations after the first one put the necessary amount of water in second after the necessary amount of sodium thiosulphate and repeat it with the chart below at the end of this method. Repeat each concentration 3 times for an accurate result and if there are any odd results repeat them. ...read more.

Middle

If there are more particles of sodium thiosulphate then there will be faster collisions for a faster reaction with the more concentrated sodium thiosulphate. Results: Sodium Thiosulphate (cm3) Water (cm3) Hydrochloric Acid (cm3) Time (seconds) Average (Seconds) 1st 2nd 3rd 25 cm3 0 cm3 5 cm3 32 32 32 32 20 cm3 5 cm3 5 cm3 40 41 41 40.6 15 cm3 10 cm3 5 cm3 *50 73 68 69.6 10 cm3 15 cm3 5 cm3 *122 110 113 111.3 5 cm3 20 cm3 5 cm3 163 169 163 165 *I am doing this result again as it did not match the other two, I did it again I got 68 seconds I already put that average in not including the odd result. *I am doing this result again because it seemed out of place the next time I got 111 seconds I calculated the average using this result as the other seemed a bit odd. ...read more.

Conclusion

Evaluation It was quite easy obtaining the results but some of them I had to repeat as they were a bit odd because I might not have put in the right amount of water. I thought my results were very accurate as I repeated each one 3 times and made an average, any odd results and I repeated it. I could improve the experiment by repeating it more times or I could have made them closer together for a more accurate result. My result proved my prediction was right; the more the concentration of the sodium thiosulphate the faster the solution will go cloudy. I would change the experiment by having sensors connected to a computer with a stop clock so when it goes cloudy it will stop the time and would be more accurate as we have a reaction time and could be less accurate than this method. ...read more.

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