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Investigate how varying certain key factors will affect the time taken for marble to react in Hydrochloric Acid.

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Introduction

GCSE Coursework Aim Our aim is to investigate how varying certain key factors will affect the time taken for marble to react in Hydrochloric Acid. Key Factors ?Temperature of Acid ?The Catalyst ?The Concentration of the Acid ?The Surface Area of The Marble I am going to investigate the difference in the time taken for marble to react in Hydrochloric Acid depending on the temperature of the acid, and attempt to discover any patterns. 2HCl + CaCO3 --> H2O + CO2+ CaCl2 This will be a good reaction to test as one of the products is Carbon Dioxide so we can measure the time taken for the gas to be produced, using a relatively simple experiment. ...read more.

Middle

We decided to test the reactivity at 40�C, 50�C, 60�C, 70�C, 80�C, 90�C and 100�C. We filled the burette up to 50cm3 and then turned it upside down with our hand over the end. We filled the basin half full with tap water and placed the burette upside down in the water, and then removed our hand. We used the G-Clamp to hold the burette in position just off the bottom of the basin. When the Acid was heated to the desired temperature we took it of the tripod and place the end of the sidearm into the bottom of the burette. We dropped the marble into the conical flask containing the acid and quickly placed the bung on the top. ...read more.

Conclusion

This agrees with my prediction, as the time taken to empty the burette of water decreased with higher temperatures. Evaluation I feel we could have improved our results by doing lower temperature acid, to produce mo�e accurate results. This would help as we could test the time taken to produce 50cc of Carbon Dioxide at room temperature, and even at much colder temperatures. We also could have done intermediate temperatures between our existing temperatures, such as doing a test every 5�C, e.g.20�C, 25�C, 30�C, 35�C and so on until 100�C. If we had been able to keep the acid at the acquired temperature this would have made our results even more accurate, as the acid probably dropped greatly in temperature as the reaction was taking place. ...read more.

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