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Factors effecting the rate of reaction between sodium thiosulphate and hydrochloric acid

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Introduction

Factors effecting the rate of reaction between sodium thiosulphate and hydrochloric acid Reaction I want to study. I want to study the effects of reaction between sodium thiosulphate with an acid (hydrochloric acid) at different concentrations. When these two are mixed fine particles of sulphur is released. It is coloured a milky yellow solution. Background Knowledge Factors that may effect the rate of reaction: - ~ Temperature- a reaction is faster when the temperature is raised. As the temperature increases every 10?C the reaction time approximately increases. ~ Concentration- a reaction increases when the concentration of a reactant increases. In this experiment we will increase the concentration of the sodium thiosulphate. ~ Particle size- the smaller the particles the faster the reaction as there will be more of a surface area for the acid to attack. ...read more.

Middle

The weaker the acid the slower the reaction will be. Variables. These are things that will effect the investigation and they must be taken into consideration when planning the experiment. Independent Variable The volume of the sodium thiosulphate will be changed in the experiment. Dependant variable In this experiment it will be the time taken for X to disappear. Controlled Variable These will be factors that I keep constant such as the volume of the acid, the type of acid, the surface area (same size of flask), same view of the X and the temperature will all be kept the same. Procedure Apparatus 3 beakers Sodium thiosulphate Stopwatch 2 measuring cylinders Hydrochloric acid Filter paper with an X marked on it Distilled water My Method Measure 10ml of hydrochloric acid in on top of a piece of filter paper with an X marked on it. ...read more.

Conclusion

This backs up my background knowledge. In dilute sodium thiosulphate there were not so many sodium thiosulphate patrticals. This means there were not as great chance of sodium particles hitting hydrochloric acid particles. When the sodium thiosulphate was more concentrated there was more sodium thiosulphate particles in it, so there was more chance of successful collisions resulting I increased rate of reaction. Evaluating evidence A few points on my graph were off the line a small amount but when I did a line of best fit it was clearer to see. My experiments accuracy could have been improved by doing repeats to give an accurate average but due to lack of time I was unable to do as many as I would have liked to. However I still do think that my experiment overall provided that conclusively that increasing the concentration, speeds up the rate of the chemical reaction. ...read more.

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