Fig. Calorimetry - Heat Capacity
Calculation - Screenshot from CHEMIX School.
Heat Capacity of the Calorimeter
1.
Add 50 g (0.05 kg) of room-temperature water to the calorimeter
cup and insert it into the calorimeter.
2.Measure 50 g (0.05 kg) of hot water (approx. 60 C),record its
temperature, and quickly pour it into the calorimeter.
3.Immediately cover the calorimeter and stir for approx. 20
seconds.
4.Record the temperature every 30 seconds, starting from (t=0),
while plotting temperature (C) versus time (s). Continue
stirring gently between each reading to ensure the temperature
remains uniform throughout the calorimeter.
5.To find T_f, use a ruler to draw a best-fit line through the
points after T_max. Extra polate this line back to (two); the
intercept is your
corrected T_f .
Enthalpy of a Chemical Reaction
1.Measure 50 mL of an 1M hydrochloric acid solution and pour it
into the calorimeter cup.
2.Measure 50 mL of an 1M sodium hydroxide solution in a sepamte
container.
3.Measure the temperature of both solutions If the temperatures
are different, use the average as the initial temperature.
5.Quickly mix the solutions in the calorimeter.
6.lmmediately cover the calorimeter with the lid. Add a
thermometer.
7.Stir gently and record the temperature every 30 5 until it
stzstabilizes. Record the higest temperature reached
Specific Heat Capacity
1.Place
the empty calorimeter cup on a balance and zero it. Add water
until the mass reads 100 g (0.10 kg).
2.Place the cup into the calorimeter, then fit the lid.
3.lnsert the immersion heater and thermometer; stir gently.
4. Connect the wires beween the power supply and the
immersion heater Switch on the power supply at 12 V and 2
A.
5.Start the stopwatch and heat for 3 minutes (180 s), stirring
gently throughout.
6.Switch off the power and reoord the final temperature.
Identify Unknown Metal
1.Measure
the mass of the metal sample and the the mass of the
room-temperature water in the calorimeter.
2.Heat the metal in boiling water intil it reaches a constant
temperature, and record the initial metal temperature.
3.Quickly transfer the hot metal into the calorimeter, cover,
and stir gently.
4.Record the temperature every 30 s until the temperature
stabilizes.
5.Record the stabilized temperature as the final temperature T_f
5.Calculate the specific heat capacity of the metal (c) using
the specific heat capacity equation and use the heat capacity
table
to determine the type of metal.