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The rate of reaction.

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Background Knowledge The rate of reaction depends on the speed at which a reaction will take place. The speed of a reaction can be observed either by how quickly the reactants are used up or how quickly the products are forming. The rate of reaction can be affected by various factors including temperature, the higher the temperature the more energy the particles will have therefore the number of collisions will increase. It can also be affected by a catalyst, the size of the particles (or surface area) and the concentration. The factor which I am concerned with in this experiment is the concentration of sodium triosulphate and hydrochloric acid. The rate of reaction simply depends on how often and how hard the reacting particles collide with each other. The more collisions that take place will increase the rate of reaction, when the concentration is increased, it means that there are more particles of reactant between the water molecules and hence, a greater amount of collisions taking place. There are three ways to measure the rate of reaction. The first is by precipitation which is when the product of the reaction is a precipitate which clouds the solution. The second method is by measuring the change in mass, usually when a gas is given off. ...read more.


In addition I will check the safety symbols on the bottles of the chemicals before I begin the experiment and I will mop up any spillages right after they occur. I will also that care not to knock over any of the apparatus as the chemicals could accidentally splash into someone's eyes. Method * Collect all of the equipment displayed on the apparatus and chemical Page * Clean all of the apparatus with distilled water, as to wash out any other chemicals * Fill the three burettes up to 0cm� using a filter funnel in each, making sure that each chemical is in a separate burette and that they do not mix * Pour the needed amount of sodium thiosulphate in to a beaker * Dispense the needed amount of hydrochloric acid into a separate beaker * Also pour the needed amount of distilled water into a beaker * Then mix the distilled water with the chemical that is changing concentration * Nextly pour the chemical you don't want to change into the conical flask, then add the other two chemicals. * When you start to mix the chemicals, you then immediately start the stopwatch * Swirl the contents of the beaker and place it on the black cross * At that time stop the stop watch when the cross underneath the conical flask has disappeared. ...read more.


My experiment could have been improved by taking more reading to get more accurate results. I would also use more hi-tech equipment such as a light sensor. I would place this under the conical flask and when the chemicals start to become a deeper colour of yellow the light senor will record the chance in the amount of light getting through the chemicals. I think that my results are reliable because I used reliable equipment and also I double checked that every measurement I took was exact. Since most of my result sit on the best fit line I can also say that my results were recorded accurately. The points that are not on the best fit line are almost on the line which means that they could have been caused by a slight increase or decrease in temperature the amounts could have been taken from another bottle therefore the moles of the different chemicals may have been different. I believe that my results are accurate enough to make a conclusion from because I have faith that I did everything I could to make my results reliable as possible. Further more I think that I could convince others that my results are accurate ...read more.

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