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Investigate the enthalpy values for the reaction between Calcium Carbonate and Calcium Oxide with Hydrogen Chloride.

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Introduction

Investigate the enthalpy values for the reaction between Calcium Carbonate and Calcium Oxide with Hydrogen Chloride. H3 CaCO3 (s) CaO (s) + CO2 H1 HCl H2 HCl CaCl2 (aq) Results Variables of CaCO3 Mass of CaCO3 + weighing bottle 3.302 g Mass of empty weighing bottle 0.831 g Mass of CaC03 used 2.471 g Temperature of acid initially 18 C Temperature of solution after mixing 21 C Temperature change during reaction 3 C Variables of Temperature Mass of CaO + weighing bottle 2.362 g Mass of empty weighing bottle 0.936 g Mass of CaO used 1.426 g Temperature of acid initially 17 C Temperature of solution after mixing 27 C Temperature change during reaction 10 C Calculations * Heat Capacity x Temperature Change x ...read more.

Middle

of the reaction by an indirect method, the H2 must be reversed so the result is changed to a positive number as shown below. H3 CaCO3 (s) CaO (s) + CO2 H1 HCl H2 HCl CaCl2 (aq) H3 CaCO3 (s) CaO (s) + CO2 H1 HCl H2 HCl CaCl2 (aq) In order to calculate the H3 you must firstly calculate the enthalpy change of H1 and H2, then reverse the Evaluation Errors In Procedure One error in the procedure of the experiment was hat the calcium oxide and the calcium carbonate were in lumps so the surface area was not as large as it could have been if I would have been provided with fine powered particles, and also the reaction would have been much quicker. ...read more.

Conclusion

250.0 C, this gave inaccurate results as the highest temperature recorded was 27 C, so I should have been provided with a thermometer with a range of up to 50 C. The measuring cylinder supplied for the measurement of Hydrochloric Acid was 100 cm , whereas I only had measure 50 cm so this may have caused an error. Also when pouring the Hydrochloric Acid into the beaker some may have been left in the bottom of the measuring cylinder meaning the results may have been inaccurate. Significant Errors However, a digital thermometer would show much more accurate temperature changes which are particularly vital when dealing with small temperature changes such in the instance of reaction 1. This would decrease the percentage error between actual and theoretical results of enthalpy change. ...read more.

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