LAB 76 - syikin

LAB 76 - syikin - Experiment 76 Heat of Reaction in...

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Experiment 76 Heat of Reaction in Solution Abstract This experiment was done adiabatically in Dewar flask to determine the heat released in an acid-base reaction in solution. The enthalpies of reaction for this reaction was found out to be as follows :- Run 1 Run 2 Run 3 ∆H 298K (kJ/mol) -81 -78 -79 ∆(∆H 298K )(kJ/mol) 20 19 17 Introduction The goal of this experiment is to measure the standard isothermal enthalpy change, ∆H° 298K , for the following reaction. The reaction investigated is given as: 2 2 4 2 ( ) 2 2 4 2 ( ) 2 2 4 cr L H C O H O NaOH Na C O H O H + + Reaction was carried out adiabatically in Dewar flask with a probe submerged in the solution to record the temperature behavior in the solution. Here, the limiting reactant is Oxalic Acid. The solvent, sodium hydroxide, was used in excess by around % 5 to make sure that oxalic acid will be completely used up. After the reaction, an electrical heating was applied to the solution for a period of time, which can be later used to determine the heat capacity. Knowing the temperature change due to the reaction and the value of the heat capacity, it will then be possible to calculate H .
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Data and calculations Run 1 Run 2 Run 3 Errors Oxalic Acid used (g) 1.4007 1.4001 1.4011 0.0001 Oxalic Acid used (mol) 0.0111 0.0111 0.0111 7.932 x 10 -7 NaOH added (g) 23.09 23.66 23.10 0.01 NaOH added (mol) 0.02325 0.02383 0.02326 Water added (g) 190.02 183.80 183.15 0.01 Time of reaction (s) 108.18 109.20 109.48 0.68 Voltage (volt) 9.868 9.446 9.880 0.247 Resistance (Ohm) 10.054 10.054 10.054 0.001 T 4 -T 3 (cm) 11.70 11.70 14.00 1.33 T 2 -T 1 (cm) 10.10 10.40 11.50 0.74 Table 1 . Data obtained from the experiment. Errors in Voltage, C p , time, T 4 -T 3 , and T 2 - T 1 are taken to be the standard deviation of the values of the three runs. Sample calculation of number of moles of solute and solvent (Run 1)
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LAB 76 - syikin - Experiment 76 Heat of Reaction in...

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