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# Investigation of Enthalpy Change When Mg is added to HCl

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Introduction

ï»¿Investigation of Enthalpy Change When Mg is added to HCl Defining the Problem and Selecting Variables Research Question: How is the enthalpy change of the reaction between Mg and HCl affected when different amounts of Mg are added to a constant amount of HCl? Variables: Independent: Mg Dependent: Temperature Control: HCl Controlling Variables I will use three different masses of Mg: 0.02g ± 0.001g, 0.03g ± 0.001g, 0.04g ± 0.001g I will measure the temperature using a colorimeter made from a foam cup, a lid, and a thermometer I will keep HCl at a constant volume of 10mL of 1M HCl Procedure: Step 1: Measure out 10mL of 1M HCl Step 2: Pour HCl into foam cup and place lid on cup Step 3: Measure the initial temperature and record data Step 4: Add in 0.02g of Mg into cup and measure the finial temperature Step 5: Calculate change in temperature by ...read more.

Middle

10°C ± 0.1°C 9°C ± 0.1°C 7°C ± 0.1°C 13°C ± 0.1°C 11°C ± 0.1°C 11°C ± 0.1°C 16°C ± 0.1°C 15°C ± 0.1°C 17°C ± 0.1°C Calculations: When a sample of Mg dissolves in 10mL HCl, the temp increases. The following are the ΔH of the 9 trials: Equation: q=mcΔT Trial 1 0.02g ± .001g Mg 1. (10mL)(4.184)(10°C)= 418.4 Qw= = -0.4184 0.02g Mg (= 0.0008 -0.4184/0.0008= -523 kJ/mol 1. (10mL)(4.184)(9°C)=376.56 Qw== -0.37656 0.02g Mg (= 0.0008 -0.37656/0.0008= -470.7 kJ/mol 1. (10mL)(4.184)(7°C)= 292.88 Qw== -0.29288 0.02g Mg (= 0.0008 -0.29288/0.0008= -366.1 kJ/mol Average of trial 1 is 453.27 kJ/mol Trail 2 0.03g ± .001g Mg 1. (10mL)(4.184)(13°C)=543.92 Qw== -0.54392 0.03g Mg (= 0.0012 -0.54392/0.0012= -453.3 kJ/mol 1. (10mL)(4.184)(11°C)=460.21 Qw== -0.46021 0.03g Mg (= 0.0012 -0.46021/0.0012= -383.5 kJ/mol 1. (10mL)(4.184)(11°C)=460.21 Qw== -0.46021 0.03g Mg (= 0.0012 -0.46021/0.0012= -383.5 kJ/mol Average of Trial 2 is 406.77 kJ/mol Trail 3 0.04g ± .001g Mg 1. ...read more.

Conclusion

Now the answer to the question -How is the enthalpy change of the reaction between Mg and HCl affected when different amounts of Mg are added to a constant amount of HCl? - Is there is an effect to the enthalpy change when different amounts of Mg are added but it is irregular and the change in the enthalpy isn?t steady in its rise or decline. The experiment was done using different foam cups and a calorimeter and the amount of time that the chemicals temperatures were recorded were different. If I was to improve this experiment I would use the same kind of foam cups and lids for each trial and I would also measure the temperature for each chemical under a specific time limit which would be the same for each trial. Investigation of Enthalpy Change When Mg is added to HCl Kerolin Francois Lab Report IB Chemistry Period 4 ...read more.

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