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Enzyme In Industry

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Introduction

Abdulrahman Al Khalifa Chemistry Gr. 11B June 3rd 2008 Mss Shaikh Rates of reactions Research question: How does the concentration of nitric acid affect the rate at which magnesium reacts with it? Apparatus/materials: * flask * measuring cylinder * Weighing scale * Gas syringe * spatula * timer * Magnesium filings * Nitric acid 0.5, 1.0, 1.5, and 2.0 molar concentrations * Metal stand * Cork (with tube attaching it to the syringe) Variables Independent Variable: Molar concentration of the nitric acid (0.5, 1.0, 1.5, and 2.0) Dependent Variable: The rate at which the magnesium reacts with the nitric acid Controlled Variable(s): environment, temperature, amount of magnesium, apparatus. Note: in order to keep everything as controlled as possible defer from touching the flask once the magnesium the reaction has started, this is due to the fact if any act of stirring takes place it will drastically affect the rate at while the reaction takes place which then will render the data collected to be futile. ...read more.

Middle

Graph(s): Above the graph shows that the reaction was in fact very slow to begin with however the change in the rate of the reaction does not change significantly. Above the graph shows that the reaction was much faster than the previous one and the change in the rate of the reaction is more clear as seen in the graph, the slope is much lower towards the end of the reaction compared to the beginning. Above the graph shows that the reaction was much faster than the previous one and the change in the rate of the reaction is more clear as seen in the graph, the slope is almost 0 towards the end of the reaction. Above the graph shows that the reaction was much faster than the previous one and the change in the rate of the reaction is more clear as seen in the graph, the slope is almost 0 towards the end of the reaction. ...read more.

Conclusion

A solution to this problem is that if we had more time in order to allow the reaction to fully complete (as seen in the graph represent 0.5 molar solution of nitric acid, the reaction actually never stopped however, we had to stop due to time restrictions). In addition a lot of gas may have escaped as the reaction fist started due to the fact that the cork couldn't have stopped all the hydrogen from escaping, this could have been avoided if the magnesium was put into any type of capsule which dissolves as it is put into acid thus delaying the reaction giving us time to seal the flask completely. Overall the experiment was a success and it did show how the concentration of an acid affects the rate at which magnesium reacts with it. ...read more.

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