CM1131_practical_2 - CM1131 Name: _ Lab Group: B1 Date:...

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CM1131 Name: ________ Date: 4-Apr-07 Lab Group: B1 LAB REPORT E XPERIMENT 2 HEAT OF NEUTRALIZATION BY CALORIMETRY A IM To determine the heat capacity of the calorimeter by making use of a known heat of dilution of sulfuric acid. To measure the heat of neutralization of a strong acid (HCl) and a strong base (NaOH), and that of a weak acid (CH 3 COOH) and a strong base (NaOH). R ESULTS Part 1: Heat capacity of calorimeter Mass of dry, empty calorimeter: 217.5g Mass of dry, filled (200ml water) calorimeter: 414.2g Temperature of water Time (min) 0 1 2 3 4 5 6 T (°C) 29.2 29.2 29.2 29.2 29.2 29.2 29.2 Temperature of water after adding conc. H 2 SO 4 Time (min) 7.0 7.5 8.0 8.5 9.0 9.5 10.0 T (°C) 32.6 32.4 32.3 32.3 32.3 32.3 32.3 NaOH titration S/N Start Vol. of NaOH / cm 3 End Vol. of NaOH / cm 3 Vol of NaOH Used / cm 3 1 3.15 23.10 19.95 2 2.65 22.60 19.95 Conc. Of NaOH solution: 0.5068M 1
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Part 2: Heats of neutralization of HCl and acetic acid with NaOH a) HCl Mass of calorimeter with NaOH: 269.0g Mass of calorimeter without lid or fittings: 168.7g Temperature of NaOH Time (min) 0 1 2 3 4 5 6 T (°C) 28.9 28.9 28.9 28.9 28.9 28.9 28.9 Mass of flask with HCl: 222.6g Mass of flask: 122.5g Temperature of HCl Time (min) 0 1 2 3 4 5 6 T (°C) 29.2 29.2 29.2 29.2 29.2 29.2 29.2 Temperature of NaOH and HCl reaction Time (min) 7.0 7.5 8.0 8.5 9.0 9.5 10.0 T (°C) 32.3 32.2 32.2 32.2 32.2 32.2 32.2 b) Acetic acid Mass of calorimeter with NaOH: 269.1g Mass of calorimeter without lid or fittings: 168.7g Temperature of NaOH Time (min) 0 1 2 3 4 5 6 T (°C) 28.8 28.8 28.8 28.8 28.8 28.8 28.8 Mass of flask with HCl: 222.3g Mass of flask: 122.4g Temperature of HCl Time (min) 0 1 2 3 4 5 6 T (°C) 29.1 29.1 29.1 29.1 29.1 29.1 29.1 Temperature of NaOH and HCl reaction Time (min) 7.0 7.5 8.0 8.5 9.0 9.5 10.0 T (°C) 32.1 32.1 32.1 32.1 32.1 32.1 32.1 2
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C ALCULATIONS Heat Capacity of Calorimeter Moles of NaOH : Moles of H 2 SO 4 = 2 : 1 Moles of NaOH used = 0.01995 x 0.5068 = 0.01011066
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CM1131_practical_2 - CM1131 Name: _ Lab Group: B1 Date:...

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