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The aim of this experiment is to compare the volume of CO2 produced as the concentration of acid used to react with the base is changed.

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Introduction

Aim Aim The aim of this experiment is to compare the volume of CO2 produced as the concentration of acid used to react with the base is changed. Method Predictions I have chosen to vary the concentration of acid. I predict that the volume of CO2 will change as the concentration of acid changes. I predict that with a lower concentration of acid the volume of CO2 produced will also be lower. I also predict that as the concentration of acid is increased, the volume of CO2 produced will be higher. Explanations The volume of CO2 produced will change as the number of moles of acid used will change. The actual number of moles of acid can be determined by using the following formula: Number of moles= volume x concentration 1000 By using the formula above, if the concentration of acid was to change the number of moles of acid used would also change. If the number of moles of acid used were changed, the number of moles of CO2 produced would change. ...read more.

Middle

Therefore, the graph showing this trend is a straight line. Also, if the concentration of acid was 0mol/litre (i.e water), there is no CO2 produced. Therefore, the line would cross the origin. Also, I noticed that as the volume of CO2 produced increased, a larger amount of gas was wasted according to the predicted amount. This is shown in the graph below: The reason why more gas is wasted when a higher concentration of acid is used is because the reaction is more vigorous. Therefore, more CO2 is produced almost instantly. Therefore, before the bung could be put on, a lot of gas is wasted (according to theory predictions). This is the reason why more gas is lost as the concentration of acid increases. With the results obtained, I can predict that as the concentration of acid increases the volume of CO2 produced also increases. However, the actual amount of CO2 produced would always be less than expected due precision and accuracy errors and the loss of gas. ...read more.

Conclusion

I know this because the measuring cylinder has 2cm3 divisions and therefore a volume can be measured to the nearest cm3. The percentage from the highest value and lowest value was calculated according to theory. Explanations The volume of CO2 produced will change as the number of moles of acid used will change. The actual number of moles of acid can be determined by using the following formula: Number of moles= volume x concentration 1000 By using the formula above, if the concentration of acid was to change the number of moles of acid used would also change. If the number of moles of acid used were changed, the number of moles of CO2 produced would change. This would also change the volume of CO2 produced as 1 mole of gas occupies 24,000 cm3, therefore a different number of moles of CO2 would produce a different volume of CO2. Improvements to the method: A lot of gas was wasted in this experiment. Therefore the following set up may be used to minimise the effect of lost CO2. Basically, the conical flask will be pre-bunged to make sure that not CO2 is lost. ?? ?? ?? ?? ...read more.

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