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How does concentration affect the rate of reaction?

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Introduction

How does concentration affect the rate of reaction? In this piece of course work I will be investigating how the change in temperature will affect the rate of reaction of Sodium Thiosulphate with water and hydrochloric acid. The time will be recorded to see how long it takes for a pencil cross to disappear. The change in temperature will be observed as well as the reaction time with different temperatures. In my experiment I will alter the temperature but the concentration of sodium Thiosulphate and hydrochloric acid will be kept constant. Sodium Thiosulphate+Hydrochloric acid---Sodium Chloride+water+Sulpherdioxide+Suulpher Apparatus Hydrochloric acid Sodium Thiosulphate Digital Thermometer Distilled Water Paper with a cross Thermostatic Baths Flask Measuring Cylinder Stop Watch Pipette Fair Test To make all experiments a fair test we used the same amount of Hydrochloric acid through out the experiment (5cm3). We also used the same piece of paper with a drawn cross. We also used the same stopwatch through out the experiments. ...read more.

Middle

Collision Theory * For a reaction to occur, molecules must collide with each other. * Molecules must possess at least a certain minimum energy necessary to break the bonds. * Molecules must have the proper orientations. * Increased temperature of reactants results in greater numbers of collisions per unit time. Method * Draw a pencil cross on a piece of paper and place it in a transparent sleeve * Rinse the conical flask with distilled water * Rinse and dry both beakers * Put a certain amount of water and sodium Thiosulphate into a conical flask * Place this into the thermostatic bath for the required temperature * Leave for 5-10 Mins until reached certain temperature * Take out the conical flask from the thermostatic bath, take to the desk and at once put hydrochloric acid in and start stop watch, take the start temperature and wait until mixture goes cloudy and the pencil cross is unable to be seen, stop watch immediately * Record temperature and time * Repeat experiment at differentTemperatures. ...read more.

Conclusion

Evaluation By doing the experiments again would be an improvement to this investigation and by gaining accurate results. Some of my results were anomalous to others although there was a pattern in my results as the line in the graph steeples soonest when the solution is hottest. I could also improve the method in this investigation. There may be aspects of original investigations that I could investigate. The most difficult part of the procedure was getting all the solution, dilute as possible and recording the temperature accurately. My graph was fairly accurate although there was one anomalous result; this was due to the lack of attention paid to the solutions. If this test was repeated then my result would be correct but due to the shortage of time it was impossible. I could extend the enquiry by doing the experiment again and by obtaining more accurate and reliable results. Safety and Hazards To make this experiment safe we wore safety glasses and lab coats to ensure our cloths were not damaged and glasses to protect our hands as some may have allergies to chemical products. Selina Esscopri 3 3 09:14 ...read more.

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