Monday, September 2, 2013

Evaluating an enthalpy change that can not be measured directly

Chemistry Experiment. Dr. Watson. Evaluating An Enthalpy Change That Cannot Be deliberate Directly. Introduction. We were told that atomic number 11 hydrogen change decomposes on warming to give sodium change, water system and carbon dioxide as shown in the par below:-         2NaHCO3(s)--------> Na2CO3 (s) + weewee (l) + CO2 (g) = DeltaH1 This was given as deltaH1 and we had to manoeuvre as department of the prove. This however cannot be mensural directly, only if can be found exploitation the enthalpy changes from 2 new(prenominal) reactions. These being that of sodium hydrogencarbonate and hydrochloric sultry and also sodium carbonate and hydrochloric acid. We were given a dip of instructions in how to cause on expose the experiment, which are given later. List of machine Used. 1 x 500ml Beaker. 1 x Thermometer(-10 to 50oC). 1 x Polystyrene Cup. 1 x Weighing Balance. 1 x Weighing Bottle. 10 grams of sodium Hydrogencarbonate. 10 grams of Sodium Carbonate. A bottleful of 2 hero sandwich HCL. Diagram. Method. Three grams of sodium hydrogen carbonate was plodding out accurately using a weighting bottle and a balance. wherefore thirty centimetres cubed of 2 molar HCL was measured using a beat cylinder. The acid was and so placed into the polystyrene cup and its temperature was taken and save using the thermometer.
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The pre- weighted sodium hydrogencarbonate was past added to the solution, and the final temperature was recorded. The contents of the cup were past emptied out and the cup was rinse out with water and and then well dried. This was do three quantify for the sodium hydrogen carbonate so that I could pack any anomalies that were obtained. The experiment was then repeated in only the same trend except sodium carbonate was used alternatively of sodium hydrogen carbonate. The results were then tabulated, this table is shown below. Results Table. Results Table... If you want to father a full essay, parade it on our website: Ordercustompaper.com

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