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The effect concentration of hydrochloric acid has on the rate of reaction -- A* - page 6
Keywords: Rate of reaction hydrochloric acid sodium thiosulphate concentration
By georgie1 on 31/12/2009
Level: GCSE Key Stage 4 (Years 10-11)
Page Number: 6 of 8 pages: 1 2 3 4 5 6 7 8and form new bonds, resulting in the products of the reaction. An increase in concentration of reactants increases the collision frequency between the reactants. Thus the effective collision frequency also increases.” This proves that as a reactant becomes more concentrated, there are likely to be more collisions, which will result in a faster production of new bonds, and therefore increasing the rate of reaction.
Evaluation
Data Collection
I collected three different sets of results to obtain an average fourth set of results. I do not believe that I recorded any anomalous results and therefore did not need to repeat any of the experiments. This means that I carried out the experiments thoroughly and accurately and controlled all other factors as well as I possibly could. My results gave me enough depth to draw a sensible and likely conclusion. However, if I had collected more than ten or so sets of results, I could have calculated the standard deviation of each length of wire to see how spread out my data was and therefore the averages would be extremely concise and reliable.
Generally, my line of best fit passes through some average results and all of the error bars. Although the error bars tend to be quite large, they are of consistent size which shows that all sets of results have been measured in the same way for reliability. These may be spread out because each time I repeated the experiment, there may have been a different amount of sunlight, which would have affected the visibility of the card marked with an ‘X’. Also, the heater in the room turns on and off at set intervals, which may have varied the temperature of the room. As a result, some of the experiments may have been more exposed to a heater than others, which would have caused a changed in the kinetic energy and therefore a change in the rate of reaction.
I have included all of my results in my conclusion and took the large error bars into consideration when making generalizations. My results have covered a wide range and I feel that they support a fairly firm conclusion because they are evenly spread out throughout the range. However, if I was to repeat the investigation, I would most probably add more concentrations within the 0.0M- 1.0M bracket, to see at what exact point the rate of reaction begins to increase less rapidly.
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