A2/ Expt /Thermal /Neil

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Information about A2/ Expt /Thermal /Neil

Published on October 10, 2009

Author: ramphy

Source: slideshare.net

Measuring Specific Heat Capacity of Water --a laboratory experiment By Neil

Apparatus and Equipment Needed a copper or aluminum calorimeter a muff an electrical immersion heater, a voltmeter, an ammeter a low voltage power supply, a thermometer (0 – 50 o C), l eads stop watch.

a copper or aluminum calorimeter

a muff

an electrical immersion heater,

a voltmeter,

an ammeter

a low voltage power supply,

a thermometer (0 – 50 o C),

l eads

stop watch.

Diagram and Set of Equipments Set the equipments in the previous page as the diagram in the left.

Steps to Be Followed Set up the apparatus as shown in the diagram. Measure the mass of the calorimeter (M c ) and fill it with a known mass of water (M w ). Record the initial water temperature ( T 1 ). Switch on the heater allow it to heat up so that it is slightly warm to the touch and then put it in the water. Place the muff over the calorimeter and heat the water for a measured time (t). Measure the final temperature of the water ( T 2 ). Record the voltage (V) and current (I), this may need to be adjusted throughout the experiment so that the power input remains constant. Repeat the experiment with a different mass of water and obtain at least six sets of values

Set up the apparatus as shown in the diagram.

Measure the mass of the calorimeter (M c ) and fill it with a known mass of water (M w ).

Record the initial water temperature ( T 1 ).

Switch on the heater allow it to heat up so that it is slightly warm to the touch and then put it in the water. Place the muff over the calorimeter and heat the water for a measured time (t). Measure the final temperature of the water ( T 2 ).

Record the voltage (V) and current (I), this may need to be adjusted throughout the experiment so that the power input remains constant.

Repeat the experiment with a different mass of water and obtain at least six sets of values

Methods of Collect Data Collection * Calculate the specific heat capacity of water from the equation: VIt = M C C C (T 2 – T 1 ) + M W C W ( T 2 – T 1 ) Where C c is the specific heat capacity of the material of the calorimeter. Record the values obtained in the table that follows: I (A) Average *C w (J/kg o C) V (V) t (s) T 2 ( o C) T 1 ( o C) M w M c (g)

Safety Measures The e lectrical immersion heater uses a.c.– be careful with electric surges. The thermometer is made of glass– be careful when handling it so that it would not be dropped.

The e lectrical immersion heater uses a.c.– be careful with electric surges.

The thermometer is made of glass– be careful when handling it so that it would not be dropped.

Methods to Reduce Random Errors Heat the water for longer time to obtain greater change in temperature. Dry the calorimeter up after each experiment, so that no water is remained inside. Use electrical multimeter instead of ammeter and voltmeter.

Heat the water for longer time to obtain greater change in temperature.

Dry the calorimeter up after each experiment, so that no water is remained inside.

Use electrical multimeter instead of ammeter and voltmeter.

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