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Investigatin the Rate of Reaction

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Investigating the Rate of Reaction Aim To investigate the effect of concentration on the rate of reaction between sodium thiosulphate and hydrochloric acid. Prediction I predict that as the concentration of the sodium thiosulphate is increased, the rate of reaction will increase. This is because there are more particles, therefore more chances of collisions. The graph that is going to be drawn in my analysis will have a positive correlation. Also it might be curved as the increase in rate of reaction which will not be exactly the same as the concentration of the sodium thiosulphate. This probably will be because there are more chances of collisions. So when the concentration will increase then the particles would have more energy and therefore it will move faster. This is the reason why they will collide more often. ...read more.


-same amount of sodium thiosulphate -same amount of hydrochloric acid -same surface area Chemical Equation Word: Hydrochloric acid + sodium� sodium + sulphur dioxide + water + sulphur Symbol: 2HCL + Na2S2O3 � 2NaCL + SO2 + H2O + S Dilutions Table: Sodium thiosulphate (cm3) Water (cm3) Concentration (mol dm -3) 50 0 1.0 40 10 0.8 30 20 0.6 20 30 0.4 10 40 0.2 Analysis My results tell me that as I used more sodium thiosulphate the concentration increased and the time taken for cross to disappear decreased. The solution with the greatest concentration was 1.0 mol dm -3 because if I look at the graph or results table then I can see that the fastest time was in concentration 1.0 mol dm -3. The disappearance of the cross was quickest when it was 1.0 mol dm -3 because there was more substance. ...read more.


I got accurate results by using accurate equipment, used burette to measure liquids. To improve the accuracy of the experiment I could've used a colorimeter, which is a meter that measures how much light it can absorb. I did not get an outlier. This is because of spillages, wrong timing or wrong results. My equipment had various levels of precision. The tolerances of each piece of equipment are: -Burette - 0.1cm3 -Measuring cylinders - 0.1cm3 -Pipette - exact to 25cm3 They helped me to measure substances accurately. I could improve my experiment by using a colorimeter, making more repeats of the experiment and look at different concentrations. Concentration of sodium thiosulphate (mol dm -3) 1 2 3 4 5 Average (seconds) 1.0 49 30 24 61 32 39.2 0.8 67 55 57 53 53 57 0.6 95 81 82 82 63 80.6 0.4 179 113 135 137 179 148.6 0.2 276 289 253 274 274 273.2 ...read more.

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