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affect of concentration

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Introduction

THE EFFECT OF CONCENTRATION ON THE RATE AT REACTION BETWEEN ACID AND CALCIUM CARBONATE (MARBLE CHIPS) My aim of my investigation is to find out how changing the concentration of an acid affects the rate of reaction between calcium carbonate (CaCO3) and Hydrochloric acid (HCI). To make it a fair test, I am only going to change the concentration of the acid. I am going to keep the volume of acid, the mass and size of the marble chips and the temperature of the acid the same to ensure a fair test. This is because by changing any of the above, I will change the conditions and therefore the results will be inaccurate and the rate of reaction will be affected. ...read more.

Middle

For example, doubling the concentration of the acid will double the rate of reaction The reaction rate, however, should theoretically decrease as the reaction between HCI and CaCO3 progresses; this is because as the reaction time increases the number of HCI molecules present will decrease as they react with CaCO3 molecules to produce calcium carbonate, water and carbon dioxide. Although carbon dioxide escapes into the air, the water produced will dilute the hydrochloric acid even further, so the concentration will go down, as there will be less successful collisions, as there will be less HCI molecules. This should therefore make the graph a curve and not a straight line. This is because the mass will not be changing at a constant rate. ...read more.

Conclusion

Collect all equipment. 2) Measure out the marble chips and the hydrochloric acid. 3) Place the acid and then the marble chips into the conical flask very quickly and sharp. 4) Put on your timer to see how long it takes to get to 20cm3. 5) Record the results and repeat the experiment again changing the amount of acid and water. 6) Record results in a table. Everything will be kept the same to insure fair test. The size of the marble chips, the temperature of the acid and the mass of the chips will be kept the same. To make it a safe test, I will wear goggles to protect my eyes in case of the acid spilling. I will also have to handle the glassware very carefully when carrying it around so that it doesn't smash. ...read more.

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