Enthalpy Change of Cumbustion of Calcium Carbonates
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Equipment
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2.54g of Caco3
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2.53g of Cao
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2.0 mol dm-3 hydrochloric acid
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Scale
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50cm3 measuring cylinder
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Thermometer
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Polystyrene cup
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Weighing bottle
Method
I will weigh a weighing bottle containing 2.53g of calcium carbonate
Using a measuring cylinder of 50cm3 I will measure 50cm3 of 2mol dm-3 of hydrochloric acid then pour it into a polystyrene cup
I will measure the initial temperature of the acid using a measuring cylinder, and then I will add the calcium carbonate to the acid. I will carefully stir the mixture in the cup with the thermometer and then take the final temperature reading when the reaction is complete.
The weigh the weighing bottle again.
Repeat this instruction using Calcium Oxide. Record data on appropriate table
Risk assessment
Hazard
Nature of Hazard
Precaution
Calcium oxide
corrosive
Be careful when adding CaO into HCl acid, avoid skin contact.
Wear safety goggles.
Hydrochloric acid
irritant
Be careful when measuring the volume of acid required for the reactions . Wear safety goggles
Analysis
Mass of calcium carbonate + weighing bottle
14.37g
Mass of empty weighing bottle
11.84g
Mass of calcium carbonate used
2.53g
Initial temperature of the acid
Temperature of the solution when the reaction is complete
26 oC
Temperature change of the reaction
Mass of calcium oxide + weighing bottle
13.44g
Mass of empty weighing bottle
10.90g
Mass of calcium oxide used
2.54g
Initial temperature of the acid
23 oC
Temperature of the solution when the reaction is complete
40 oC
Temperature change during the reaction
17 oC
To calculate the energy change of the reaction between calcium carbonate and hydrochloric acid I will assume that HCl has the same density 1gcm-3 and same specific heat capacity as water- 4.2g-1k-1.
The volume of hydrochloric acid used in this reaction is 50cm3 but I will assume that as a mass it is 50g. Using the formula E = MCв?†T, I can then calculate the energy change of the reaction.
E = 50 Д– 4.2 Д– 4
= 840j