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

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Introduction

The effect of changing concentration of sodiumthiosulphate on the rate of reaction between sodium thiosulphate and hydrochloric acid What we are trying to do - we are trying to find out whether changing the concentration of a chemical (sodiumthiosulphate) will increase or decrease the rate of reaction. We will notice the speed of the reaction because the particles will collide either more or less. The higher the concentration of thiosulphate the more the particles will collide into each other and create a chemical reaction, the more they collide into each other, the faster and the greater the chemical reaction will be. A chemical reaction is when two or more compounds are chemically joined. Prediction- I predict that the higher the concentration of sodiumthiosulphate the faster the chemical reaction will happen the reason I predict that this will happen is because the higher the concentration of thiosulphate the more the particles will collide into each other, causing a greater chemical reaction. ...read more.

Middle

* Place chonical flask on cross which is on the white tile. * Pour 10cm3 of hydrochloric acid into a test tube.(you only need 10cm3 for each experiment) * Pour required amount of sodium thiosulphate into a measuring cylinder for the first experiment you will need 60cm3 or thiosulphate, for the second you will need 50cm3, for the third you will need 40cm3, for the fourth you will need 30cm3, for the fifth you will need 20cm3 and for the sixth you will need 10cm3 * Pour the required amount of water into a measuring cylinder. for the first experiment you will need o cm3 of water, for the second you will need 10cm3, for the third you will need 20 cm3, for the fourth you will need 30 cm3, for the fifth you will need 40cm3 and for the sixth you will need 50cm3 or water. ...read more.

Conclusion

On my graph m results were a curved line this means that the rate of which the reaction took place slowed down as the concentration of the sodiumthiosulphate was decrease. The only thing that went wrong with my experiment was that the results were not as accurate as they might have been if they were done using electronic equipment or doing more experiments. Conclusion- when I predicted that the rate of which the sodiumthiosulphate would react with the hydrochloric acid I predicted that it would increase as the concentration was increased. This is because the higher the concentration of thiosulphate the more the particles will collide into each other and create a chemical reaction, the more they bump into each other, the faster and the greater the chemical reaction will be. The chemical equation for the experiment is this: Sodiumthiosulphate + hydrochloric acid = sald+water+so2+s Mark Austen Form: 106:NJP 04/05/07 Mark Austen Form: 106:NJP 04/05/07 ...read more.

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