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# Design an experiment to investigate how one factor can change the rate/speed of a chemical reaction.

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Introduction

Brief: Design an experiment to investigate how one factor can change the rate/speed of a chemical reaction. Investigating the effect temperature has on the rate of a reaction between Calcium Carbonate and Hydrochloric Acid. I have decided to investigate CaCo3+HCl as my chosen experiment. Most acids react with most things. By changing some factors you can increase or decrease the rate of a reaction e.g. In class experiments I have seen that the more dilute acid is used the slower the rate of the reaction will be. This is because there are fewer particles to collide together. The factor I will change will be the temperature, if you increase or decrease the temperature the particles move more or less vigorously the particles then have more or less chance of colliding with the particles making more of an effect on the reaction. ...read more.

Middle

* Measure up to 50ml3 each time Method I will use a conical flask, syringe, stop watch, measuring cylinder, undiluted acid and marble chips. At first I will do a preliminary experiment to work out how many readings will be more accurate and what temperatures will be the best to use also the amount of acid used. In my preliminary investigation I have found that the amount of calcium carbonate will be best if I used 5g and the amount of Hydrochloric acid will be 30cm3. This was good measurements to react with. I will start with the acid at a temperature of 20'c and go up in 10'c up to 60'c. ...read more.

Conclusion

The factor I changed was the temperature of the acid which was heated in a water heating bath which was quite away from where I was doing the experiment this means that the temperature may have dropped by the time I got to carry out the experiment. The experiment was done over a duration of three days this means that it wasn't always possible to get the same equipment such as the gas syringe this means that the readings may have been different because of the markings on the syringe. It was also quite difficult to put the bong on to the conical flask as soon as the acid and calcium marbles had contact this means that some gas could have already escaped. ...read more.

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