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What affects the Rate of Reaction when Calcium carbonate is dissolved in nitric acid?

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Introduction

What affects the Rate of Reaction when Calcium carbonate is dissolved in nitric acid? Introduction This Sc1 is about looking at what affects the rate of reaction in an experiment and why it affects it. For example you can use several ways to find this out. One way is by adding a catalyst, by adding a catalyst you can increase rate without the catalyst being used up itself. Different reactions need different catalysts. They also can reduce the activation energy, this is good for big industries because the faster the product is made the less costly it will be. Activation energy basically means the energy needed to break reactant bonds. An example of a catalyst being used is, magnesium dioxide catalysing the decomposition of hydrogen peroxide. Another to see what affects the rate of reaction is to increase the temperature. By increasing the temperature, the particles will have more energy and will move faster. This will make them collide more and with greater energy. Changing the surface area affects the reaction as well. A larger surface area will give a faster reaction. This is because reactions happen on surface of solid reactions. ...read more.

Middle

Each time we did the experiment we timed the reaction for five minutes. We gradually increased the concentration of the acid by 0.5 molars. The most we increased it till was 2 molar because this was the most concentrated we could get hold of and we never needed anymore to see the result. To make it a fair experiment we had to measure the acid and water as precise as possible each time round. Also we had to make sure that when we changed between test tubes we tried not to lose any bubbles. The time was stopped and started as close as possible without too much of a difference. We tried to as much as possible to get everything thing on target, but there were some slight mess-ups. Every molar was repeated 3 times for accurate results in case we had accidentally got something wrong in one. Diagram Results These are our results for each different molar of concentrated acid starting from 0.5 to 2.0 molar. Each one was repeated three times for accurate results. Time (sec) 1st 2nd 3rd Average 0 0 0 0 0 30 0 0 0 0 60 0.5 0.5 0.2 0.4 90 0.7 0.8 0.5 0.7 120 1.0 1.2 0.8 1 ...read more.

Conclusion

There were one or two major times where all the results of that experiment were different to the others, this was the first experiment of the 1.5 molar-concentrated acid. This could have happened because the acid was measured wrong; all the results for that first experiment were higher than the others. This also could have been a result of too less calcium carbonate being put in, which resulted in a quicker reaction. We knew this column was odd because the other results for that 1.5 molar experiment were similar too each other. Other than that the majority of the results were all overall quite good. The experiment could have been improved a lot and we could have got much more accurate results. We could have improved it by using accurate scales, which would have told us more precise readings. Another way to improve our experiment is to use a gas syringe; this would have made it easier to read the reading when the gas was being given off. Other things we could have done are to use better measuring instruments for the acid. By using these two improvements we could have got better results and overall much clearer difference. ?? ?? ?? ?? Kanwaljit Singh NagraNagra Family Page 1 5/4/2007 ...read more.

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