Evaluation
My results were not very good. They do show, as predicted, that the higher concentrated acids produced more hydrogen than the lowly concentrated. This was the common trend with my results. How ever, a few results did break the trend and the 2.5 molar reaction gave poor and unexpected results. The 1.0 molar reaction created more hydrogen than the 1.5 molar reaction. This could be because once a reaction had made over 100cm" of hydrogen, the gas syringe had to be reset. This could have caused inaccurate readings. To avoid this problem in the future, I could simply use a larger gas syringe. However my results only proved that the reactions using the highly concentrated acid reacted rapidly at the start.
If I was to do this experiment again I would use a larger gas syringe to ensure that the change over does not affect my results. I also felt that it was hard to get accurate results for the rapid reactions, as the syringe was moving at great speed. The faster reactions could maybe be measured less frequently to give more accurate results.
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