Essay on Physics

1029 Words Sep 9th, 2013 5 Pages
Physics Lab 4 (design)

Design
Aim
To measure the effect on the heat of fusion of ice with varying percentage impurities of NaCl crystals in the water.

Apparatus
Ice cubes
Distilled water
Sodium Chloride crystals
Styrofoam cup
Calorimeter
Digital balance with uncertainty (±0.01 g)
Clamps
Freezer
Digital thermometer with uncertainty (±0.1°C)
Glass rod
Glass dish
Pipette (±0.01 cm3)

Variables

Manipulated variables: Amount of impurity added to the water

The aim of the experiment was to find the effect that impurities have on the heat capacity of the solution. Therefore the amount of impurities added to the water was varied. The amount added was 0%, 10%, 20%.

Responding variable: Heat of fusion of the ice cube
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The mixture is stirred occasionally using a glass rod. The temperature should be recorded until the temperature of the mixture stabilizes.
The mixture should then be checked to make sure that the ice Is completely melted.
Measure the final weight of the mixture + weight of the cup.
This process should be repeated 2 more times to reduce human error.
This process should then be completely repeated from step 1-14 with distilled water containing 10% and 20% impurities of NaCl crystals concentration with respect to mass.

Data Collection and processing

Raw data

Table consists of the data collected in the lab relating to the Heat of fusion of ice. (Distilled water used to make ice)

|Sr. No. |Room temperature |
| |(± 0.1°C) |
|1 |346 ± 5.49 |
|2 |377 ± 6.47 |
|3 |323 ± 5.27 |
|4 |320 ± 4.92 |
|5

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