Wednesday, April 25, 2012

To see how fast limestone dissolves in an acid solution.

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To see how fast limestone dissolves in an acid solution.


Surface Area


Aim To see how fast limestone dissolves in an acid solution.


Prediction


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I predict that that 1 solid limestone weighing g will take longer to dissolve than powdered limestone weighing g. I predict this because the more surface area there is exposed to the hydrochloric acid the faster reaction will take place, therefore it will dissolve quicker.


Apparatus


Glass beaker


Cork


Hydrochloric acid


Calcium Carbonate


Glass bowl


Stopwatch


Method


1) Collect 1 solid piece, solid pieces, solid pieces and powdered limestone all weighing g each.


) Place 50 ml of m hydrochloric acid in a beaker and add the 1 solid piece of limestone.


) Put the cork in top of the beaker and start the stopwatch.


4) Time how long it takes for the limestone to stop bubbling and put the results in your table.


5) Repeat this with two pieces of limestone, three pieces and powdered limestone.


Fair test


To make sure that this experiment is a fair test consider the following· Make sure there is the same amount of Hydrochloric acid, this could affect the rate of reaction.


· Make sure there is the limestone’s weigh the same, if the weight is not the same the reaction time won’t be accurateKey Factor


The key factor in my experiment is the form of the limestone ranging from 1 solid piece to powder both weighing g.


Results


Conclusion


The results show that my prediction was correct and it took longer for one solid piece of limestone to dissolve than the powdered limestone. I also noticed that it took less time for the two solid pieces and an even shorter period for the three solid pieces to disolve.


Evaluation


By looking at my graph I can see that my results are very accurate. I think that the equipment used and the way the experiment was conducted contributed to these results. If I were to redo this experiment I would change the weights of the limestone.





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