How the Concentration Affects the Rate of the Reaction

Topics: Reaction rate, Hydrochloric acid, Chemistry Pages: 7 (2031 words) Published: December 4, 2010
Title Page Number

Diagram of Apparatus
Risk Assessment ` Table of Results
Line of Best Fit Graph
Error Bars Graph
Gradients Graph
• Error Bars Analysis
• Improvement Assessment
• Improved Experiment.
• Reliability


For this data analysis project, I conducted and experiment to investigate how the concentration of an acid affects the rate of the reaction. I have set up the experiment’s equipment as shown on figure 1. As you can see by figure 1, I have used the reaction between sodium thisoulphate solution and hydrochloric acid (HCL) to come up with results that will help me draw conclusions regarding the effects of the concentration of the acid. I decided to use this particular reaction due to the fact that the product of the reaction between sodium thisoulphate and hydrochloric acid (HCL) is precipitates of sulphur which tend to turn the solution cloudy. As a result, the cross beneath the conical flask (see figure 1) would disappear/ become difficult to be seen when the reaction has taken place. Therefore, the idea is that 50 cm³ of sodium thisoulphate are made to react with 5 cm³ of hydrochloric acid that is of different concentration each time. The concentrations of hydrochloric acid used varied from 0.1 to 5 moles. Afterwards, the cross is observed through the top of the conical flask until it because invisible. The time of which this happens is then recorded and monitored using a stopwatch. The symbol equation of this reaction is as follows:

The above symbol equation shows the reaction: Sodium thisoulphate reacts with hydrochloric acid to form sodium chloride, water, precipitate of sulphur as well as sulphur dioxide. The results that I recorded from this experiment were poor. This is because they were not entirely accurate and did not make sense. As a result, my teacher gave me a different set of results that were recorded at different temperatures to analyse and help me write up. The table of results (table 2), shows the results obtained at 3 different trials of the same experiment. The reason behind repeating the experiment 3 times is to ensure that the result’s reliability is of a satisfactory level. After the experiment was conducted, I looked back at the equipment I used as well as the steps I carried out during the process. I did so to recognize the risks associated with carrying out such experiments. To prevent or minimize such risks in future experiments, I conducted a risk assessment that is shown on the following page:

Risk Assessment

|Risk |Damage |Prevention Method | |Hydrochloric Acid (HCL) |Hydrochloric acid is corrosive. |Eye protection must be worn at all times during | | |Therefore it can damage skin. |the experiment. | | |It can also damage eyes. |Ensure it does not come into contact with skin | | | |and if it does rinse thoroughly. | |Conical Flask (glass) |Can roll down the bench |Make sure apparatus made of glass are not | | |Broken glass can cut/damage skin. |chipped. | | | |Wear gloves if possible | | |...
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