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# How concentration effects the rate of a chemical reaction

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Introduction

How concentration effects the rate of a chemical reaction Aim: To show the relationship between the concentration of hydrochloric acid and rate of a chemical reaction. Introduction: I am going to show the relationship between concentration of acid and the rate of reaction. To do this I will measure how long different concentrations of hydrochloric acid take to react then calculate the rate of these reactions. Preliminary work: For my preliminary work I tested which sized calcium carbonate pieces to use, Large, Medium or Powder, and what strength Hydrochloric acid to us, 1M or 2M. ...read more.

Middle

2M hydrochloric acid Safety Goggles Method - Weigh 3g of Calcium Carbonate in each of the 100ml beakers - Connect the conical flask to the gas cylinder via the rubber tube. - Measure 30ml of hydrochloric acid in the 50ml measuring cylinder and put it in to the conical flask - Add 1 beaker (3g) of calcium carbonate to the conical flask, close the bung and start the stop clock. - Every 10 seconds measure the amount of gas in the gas cylinder until either the gas cylinder reaches 100ml+ (full) ...read more.

Conclusion

- Measure 10ml of acid and 20ml of water and repeat. - Measure 5ml of acid and 25ml of water and repeat. - Repeat all 6 experiments at least twice for accurate results. Analysis In conclusion, the more concentrated the acid is, the faster it reacts with the calcium carbonate, therefore meaning that with lower concentration, the rate is lower. If I repeated this investigation I would repeat the experiments more to get a more accurate result, and possibly discount experiments that seem to have different results to the others ...read more.

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This report lacks most of the key elements required in a laboratory report. Suggestions have been made throughout to improve. The basic elements are there but have been omitted from the experimental write up.

Marked by teacher Cornelia Bruce 17/04/2013

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