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To investigate how concentration affects the rate of reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

Rates of Reaction Aim: To investigate how concentration affects the rate of reaction between sodium thiosulphate and hydrochloric acid. Word Equation Sodium Thiosulphate + Hydrochloric Acid - Sulphur + Sulphur Dioxide + Sodium Chloride + Water Balanced Equation Na2 S2O3 (aq)+2HCL(aq) - So2 (g)+2NaCl (aq) Introduction The rate of a reaction is the speed at which a reaction happens. If a reaction has a low rate that means the particles collide at a slower speed than a reaction with a high rate. Chemical reactions only occur when reacting particles collide with each other with sufficient energy. Activation energy is the minimum amount of energy needed to cause a reaction. Temperature, surface area, concentration, and a use of catalyst are the four different ways in which you can increase the rate of reaction. ...read more.

Middle

In a reaction where one or both reactants are in high concentrations the particles are crowded close together and will collide with each other more often, resulting in an increased number of successful collisions. Catalyst A catalyst is a substance, which speeds up the rate of a chemical reaction (catalyst doesn't run out). Different reactions need different catalyst. Catalyst work by reducing the activation energy. Surface area Large particles have a small surface area in relation to their volume this means that less particles are exposed and available for collisions. This means less collisions and a slower reaction Small particles have a large surface area in relation to their volume, this means that more particles are exposed and available with collisions. ...read more.

Conclusion

Diagrams Apparatus Conical flask Hydrochloric Acid Sodium Thiosulphate Goggles Measuring Cylinder Stopwatch Thermometer Beaker 'X' (drown onto a piece of paper) Method 1. Get all the apparatus as listed above (making sure you put on your goggles). 2. Next set up the five conical flasks so they are in a row on a table. 3. Pour out 10ml of sodium thiosulphate into the other measuring cylinder. Pour this into the conical flask with the HCL in it and as you pour the thiosulphate into the conical flask start to time how long it takes for the 'X' to disappear. 4. Do this experiment again but for each of the other concentrations 5. Then put all the information into a table and graph. ?? ?? ?? ?? David Stewart CO6 ...read more.

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