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My aim is to see how concentration affects the rate of reaction.Sodium Thisulphate + Hydrochloric acid sodium chloride

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I have been set a task to investigate the rates of reaction. Before I carry out my experiments I will have to draw up a plan to ensure that the experiments are carried out properly. Aim: my aim is to see how concentration affects the rate of reaction. Sodium Thisulphate + Hydrochloric acid sodium chloride + sulphur dioxide (Na2S2O3) Sulphur + water Control variable: I must make sure the temperature stays same. Independent variable: the concentration of sodium thisulphate. Dependant variable: I am going to measure the time in seconds. Temperature Concentration Catalyst Surface area Pressure Temperature: I must make sure the temperature stays same. In a cold reaction mixture the particles are moving quite slowly, particles will collide with each other less often, with less energy, and fewer collisions will be successful. However, if I heat the reaction mixture the particles will move more quickly, the particles will collide with each other more often. With greater energy, and many more collisions will be successful. Catalyst: A chemical substance that increases the rate of a reaction without being consumed; after the reaction it can potentially be recovered from the reaction mixture chemically unchanged. ...read more.


If the two colliding molecules have sufficient energy they will react. Pressure: By reducing the volume in which the same amounts of particles exist the pressure is increased. Once the same numbers of particles are in a smaller area there is less space in which to move and so the particles are more likely to hit each other. It is therefore possible to predict that increasing the pressure will result in an increase in the rate of reaction. I will not test this variable because the school doesn't have the facilities to test it. However pressure is a continuous variable. Hypothesis: I think that the greater the volume of HCL the quicker the reaction is going to be. But the surface area must be same. I think it is because the higher the concentration the more chance of all the particles colliding which makes a quicker reaction. 4). Apparatus: here is the list of equipment that I will need. Connical flask (for mixing the chemicals). Measuring beaker (For measuring the water and hydrochloric acid). ...read more.


Then I will clean everything with distilled water and dry it. I will then put 10ml of HCL in the measuring cylinder just under 10ml then top it up with a pipette just to be exact. I will then poor the HCL in the connical flask with sodium thisulphate50ml while waiting with a stopwatch. I will then poor the HCL in the connical flask and as soon as they touch I will start the stopwatch. When the cross is not visible anymore I will stop the stopwatch. I will do the same but this time 40 ml of sodium thisulphate and 10ml of water. I will keep going down by 10 ml for sodium thisulphate and up 10 ml for water. After one reading I will note it down. I will clean the apparatus with distilled water and dry it then repeat the experiment two more times. I will then write down my results of all my readings. NO Volume of Na2S2O3 Volume of water Volume of HCL Time reading 1 Reading 2 Reading 3 Average time (sec) Concentration of Na2S2O3 1 50 0 10 2 40 10 10 3 30 20 10 4 20 30 10 5 10 40 10 6 ...read more.

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