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Find out if the rate of reaction varies with different amounts of concentration.

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Introduction

Investigating the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid Aim: Our aim is to find out the rate of reaction varies with different amounts of concentration. Hypothesis: As the concentration increases the rate of reaction will change. Scientific Knowledge: The reactants (Na S O and HCl) should collide for the reaction to happen. A higher concentration of Sodium Thiosulphate means more particles are present, this means more collisions will occur. Less concentration of Sodium Thiosulphate means fewer collisions will occur. There are factors, which could change the rate of reaction, these are: TEMPERATURE CONCENTRATION: This is the 1 factor that will be changed. SURFACE AREA PRESSURE CATALYST In the reaction I am investigating no catalysts and solid reactants are used, therefore surface area is not important in this experiment. ...read more.

Middle

5cm of water of HCl (Hydrochloric Acid) and 40cm of Sodium Thiosulphate which varied concentration from 40ml to 5ml are poured into two measuring cylinders and then poured into a conical flask which is placed on top of the piece of paper marked with the letter X. The stopwatch will now be started. We will wait until we cannot see the concentration and see the cross. Diagram to show set up: Look down at cross from above Results Table ( to show how the results will be taken down) Na S O H O HCl Time 1 (s) Time 2 (s) Time 3 (s) Average Analysis I feel that my results are good. All of the results fitted the line of best fit perfectly and no anomalies were found in the graphs. ...read more.

Conclusion

In a more concentrated solution, there are more atoms to collide so the reaction time is quicker. Evaluation My experiment went according to plan I had no problems doing it. I believe there is always going to be a human error factor involved when you are measuring liquids and looking for an end point in the reaction.Although the reaction that was done had a fairly definite end point it was still hard to tell whether the whole cross had disappeared or not. Even though these human errors did occur I still feel that the experiment on a whole was fair I feel that my results are very accurate and have a certain amount of consistency between them it wouldn't be necessary to repeat them again. ...read more.

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