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The effect of concentration on the reaction rate:

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The effect of concentration on the reaction rate: I) Aim: Observe the effect of concentration on the reaction rate. II) List of equipment: - 155 cm3 of sodium thiosulphate solution - 150 cm3 of water - 25 cm3 of hydrochloric acid - flask - cylinder - timer - safety goggles - lab coat - a paper with a black cross on it III) ...read more.


* Then we redo the processes with different concentration of sodium thiosulphate solution by adding water. IV) The table of results: Volume of sodium thiosulphate solution (cm3) Volume of water (cm3) Time taken for the cross to disappear (s) Concentration of the sodium thiosulphate solution (g/dm3) Rate of the reaction (/s) 50 0 25 40 1/25 = 4.00*10-2 40 10 30 32 1/30 = 3.30*10-2 30 20 38 24 1/38 = 2.60*10-2 20 30 65 16 1/65 = 1.55*10-2 10 40 140 8 1/140 = 7.15*10-3 5 45 334 4 1/334 = 3.00*10-3 V) ...read more.


The graph shows that if you double the concentration it will double the rate of reaction. It may happen like that, but the relationship may well be more complicated. Conclusion: This reaction involves collision between two different types of molecules: molecules of hydrochloric acid and molecules of sodium thiosulphate solution. In order for any reaction to happen, those particles must first collide. If the concentration is higher, the chances of collision are greater and the reaction happens quickly. ...read more.

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