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To find out how concentration affects the rate of reaction between Calcium Carbonate and Hydrochloric Acid.

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Introduction

Chemistry Coursework Aim: To find out how concentration affects the rate of reaction between Calcium Carbonate and Hydrochloric Acid. Apparatus: Conical Flask, bung, large and small measuring cylinders, bowl/water bath, rubber tubing, scales, stop watch, Calcium Carbonate chips and Hydrochloric Acid. Scientific equation: 2HCl (aq) + CaCO3 (S) --> CaCl2 (aq) + H2O (l) + CO2 (g) Diagram: Safety Precautions: * Always wear goggles * Ware an apron * Wash hands after handling calcium chips * Be careful with the acid * Stick to written amounts of acid and calcium Variables: Input Output ...read more.

Middle

Put 'x' amount of acid and water solution into the conical flask. Place in 'x' weight of Calcium Carbonate chips then start the stop watch as soon as the bung is replaced in the conical flask. Time how long it takes to collect 50ml3 of gas. Now change the concentration of the acid in the solution and do the same two more times. When this has been done change the weight of calcium chips and perform experiment three times with that weight. ...read more.

Conclusion

Results: Concentration % Time At 50ml3 Average 60 3.43 minutes 3.48 minutes 3.29 minutes 3.40 minutes 70 2.30 minutes 2.43 minutes 2.32 minutes 2.35 minutes 80 2.08 minutes 2.04 minutes 2.11 minutes 2.08 minutes 90 1.23 minutes 1.51 minutes 1.38 minutes 1.37 minutes 100 1.09 minutes 1.22 minutes 1.23 minutes 1.18 minutes Conclusion: The time gets shorter as the concentration of acid gets greater; slowly the time decreases as the acid grows form 60% to 100%. This confirms my prediction to be correct. ...read more.

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