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Calcium + Hydrochloric -> Calcium + Carbon Investigation

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Introduction

Calcium + Hydrochloric -> Calcium + Carbon Carbonate Acid Chloride Dioxide Prediction I predict that the higher the concentration of hydrochloric acid, the quicker the reaction between hydrochloric acid and calcium carbonate will take place. E.g. double the concentration, halve the time it takes for the reaction to take place. This is because as a substance becomes more concentrated there are more particles of that substance in a given space. The greater the concentration of particles, the greater the chance they have of colliding with each other and therefore more chance of reacting quickly. This is the kinetic theory. Apparatus The apparatus needed for the experiment is: * Conical flask * Delivery tube * Large beaker * Burette * Measuring cylinder * Stop watch Diagram Method In this experiment we are going to find out how variables will affect the speed of reaction between calcium carbonate and hydrochloric acid. ...read more.

Middle

We will measure out 10g of calcium carbonate on a top pan balance and then it will be put into a conical flask. Then 50ml of hydrochloric acid will be put into the conical flask along with the calcium carbonate. At the same time a bung will be fitted on top of the conical flask with a delivery tube in it and the stopwatch will be started. The gas produced will travel through the delivery tube and into the burette, displacing the water in it. When 50cm of water has been displaced the timer will be stopped and the results will be recorded. The experiment will be repeated but with weaker concentrations of hydrochloric acid. The order of the experiments are as follows: Order Hydrochloric Acid (ml) Water (ml) 1st 50 0 2nd 40 10 3rd 30 20 4th 20 30 5th 10 40 There is no point doing the experiment with just water and no hydrochloric acid because calcium carbonate doesn't react with water. ...read more.

Conclusion

Evaluation The apparatus used was only as accurate as the people using it. Obviously the water being displaced out of the burettes had to be judged by eye. The equipment used could be bettered by using digital equipment. When we measured out the 10g of calcium carbonate, we used a digital top pan balance. This could not be more accurate and so we made sure that 10g was measured out exactly each time. On their own these results aren't very reliable. For example, something could have been wrong with the equipment that we didn't know about and could have hampered the results. The best way to get the most reliable results is to do the whole experiment several times and then take the average of the results. Doing this would also show any data that is incorrect. ?? ?? ?? ?? Chris Eland 5S2 ...read more.

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