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To watch and keep record of the effects of a change in concentration on the rate of reaction.

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Rate of Reaction Aim: To watch and keep record of the effects of a change in concentration on the rate of reaction. Word equation: Hydrochloric Acid + sodium thiosulphate --> Sulphur dioxide + Sodium Chloride + water 2HCl + Na2S203 --> 2Na + SO2 + H2O Plan: In this experiment I will be testing the rate of reaction of Hydrochloric acid and Sodium Thiosulphate. The rate of reaction tells us how quickly a reaction happens, so I will increase the concentration of the hydrochloric acid each time I do the experiment, adding 1/4 of distilled water to 2 molars of the acid therefore providing us with the concentrations 2, 1.5,1,0.5 and finally 0 to react with the acid. I will do a pretest first to see if the amounts of acid and Sodium Thiosulphate work and to see if there won't be any anomalous results. Equipment: Diagram of equipment: 2x beaker 4x conical flask 2x measuring cylinders Funnel X board Stopwatch Prediction: I predict that each time we increase the concentration of the Hydrochloric acid the amount of time it will take ...read more.


We will place this beaker over a cross on a piece of paper, we will look through the beaker at the cross and measure the time it takes for the liquid to go cloudy enough so we can't see the cross. We measure the time using stopwatches. We will do this 3 times each for the concentrations of 0mol, 0.5mol, 1mol, 1.5mol and 2mol. We will then collect the results into a results table and draw a graph. Results table: 3 Experiments (seconds) Average Concentration (moles) Pretest 1 2 3 (Seconds) 0 ...... ...... ...... ...... ...... 0.5 35.7 41 40 40.6 40.5 1 31.7 32.4 31.4 35.4 33.1 1.5 30.4 34.1 36.2 30.8 33.7 2 29.3 31.4 30.8 31.5 31.2 Analysis: In my experiment I used a concentration of 0 and from my results you can see that I didn't get any results for this because if the concentration is very low or 0 then its going to take an infinite amount of time to react if the concentration is very high then its going to react very quickly but it will always take an finite time no matter what the concentration is. ...read more.


is a anomalous result, 1 out of the 3 tests done was correct so there was a third of a chance it coming out correct making it into the curved line of best fit. I think our method was good and was probably not the cause of the anomalous result, but may be somewhere extra sodium thiosulphate was added by accident. To make the test fairer I could also try to keep the temperature constant. Also whoever timed the experiment could have gone a few seconds out causing the reaction to last longer than it should have. I think that my evidence is sufficient enough to support my results and I feel that my method worked well. To improve the accuracy of the timings I would consider using a light sensor hooked up to a computer, which automatically stops the stopwatch when light intensity decreases after a certain point, in other words when the solution becomes too cloudy it stops the stop watch which means each test is stopped at the same point therefore the accuracy of each test is improved. Amy Wells ...read more.

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