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# Lab report rates of reaction

Extracts from this document...

Introduction

LAB WRITE UP Research Question: Can the differentiation in the size of reactants such as marble chips affect rate of reaction? Can the three different solutions ( Hydrochloric acid, Nitric Acid and Sulphuric Acid) help support the conclusions being drawn up from the testing? Variables: Controlled Variables: 1. We should keep the same amount of calcium carbonate when re-doing a trial. 2. The same reduction in the sizes of the marble chips should be constant. For example we are starting with the biggest marble chips of area 12cm^2, then we are going to move down to a medium marble chip size of area 8cm^2 and then finally to a chip size of area 4cm^2. This should be constant. 3. The time given to check the reaction should be constant. (3 Mins ). Since we are taking a RATE, it is going to be Variable / Time. The time needs to be constant. 4. The volume of the solutions used should be kept constant at 50ml 5. The acids should also be of the same mole. 0.5 mole. If this is obstructed then concentration will play its part in the rate of reaction. ...read more.

Middle

Therefore what we did was put in the type of marble chips into the flask to start the reaction and then block it with the cork that has the tube attached to it that will take the CO2 into the measuring cylinder. 7. After that we wait for exactly three minutes and take the tube out of the measuring cylinder so that it doesn't transfer any more CO2 into the measuring cylinder for then it will not be a fair test. After we stopped the experiment we take down/record the amount of CO2 on the table's we created. Data Collection: Solution: Hydrochloric Acid (0.5 moles) Material: CaCO3 Measuring: Amount of CO2m Time: 3 minutes Surface Area of marble chips Amount Of CO2 (ml) T2 Amount Of CO2 (ml) T3 Amount Of CO2 (ml)T3 Amount Of CO2 Average 12cm^2 15 ml of CO2 16 ml of CO2 15 ml of CO2 15.333 ml 8cm^2 23 ml of CO2 24ml of CO2 24ml of CO2 23.667ml 4cm^ 59 ml of CO2 60 ml of CO2 60 ml of CO2 59.7 ml Average = sum of numbers/Number of Numbers. Average for the first testing (12cm^2) ...read more.

Conclusion

Using more trials will help give specificity to our Data Analysis. For example we only have 3 points in the graph for each line. If we had for example 5 or 6 tested variables this will help strengthen the proposition of the graph. 2. We did not test a wide variety of acids. As we know the acids react differently. If we tested, for example 8 acids we can make a more general statement. We never know if it is only these specific acids this size theory works for, always, testing more variables will help make a better general statement. 3. Other factors that affect the rates of reaction might have biased the data analysis a bit. For example the temperature of the marble chips or the acids used might have differed and since temperature affects the rate of reaction, the data might have been corrupted. Since we are checking for the rates of reaction this issue is a really huge problem that can lead to huge inaccuracies, but that is only if the temperatures differed by a lot. I mentioned this in my controlled data section. The major thing is that we cannot make the temperature within the marbles the same. Since marbles are heat convectors it is really hard to keep temperature in this experiment constant. ?? ?? ?? ?? Ali Abdulrahman ...read more.

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This report is generally well written. The main limitation to its effectiveness is the lack of scientific detail. There are specific strengths and improvements suggested throughout.

Marked by teacher Cornelia Bruce 18/04/2013

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