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# IB IA: Gas Law Experiment - testing Boyles Law, Charles Law and Ideal Gas Law.

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Introduction

IB INTERNAL ASSESMENT - CHEMISTRY LAB REPORT. Objective: I. Investigating the effect of pressure on the volume of gas. II. Investigating the effect of temperature on the volume of gas. III. Studying the ideal gas equation. Apparatus: Ruler, opened end monometer, glass tube, thermometer, conical flask, beaker, mercury plug, retort stand, Bunsen burner. Materials: Rubber band, aluminum foil, ice, water bath, anti bumping granule Experiment 1 - Boyle's Law Hypothesis: The volume of gas is inversely proportional to its pressure. Variables: I. Independent: The gas pressure II. Dependent : reading of the ruler which represents the gas volume III. Constant: Temperature. Result: Reading on the clip: 47.30 � 0.05 Reading where mercury of both opening has the same level: 34.00 � 0.05 Volume of gas under atmospheric pressure Patm: 13.30 � 0.05 Mercury level in closed end tube(mm) � 0.5 mm Mercury level in opened end tube(mm) � 0.5 mm Difference in height = P hg Pressure of gas, P (P = Patm + P hg ) ...read more.

Middle

Constant: Pressure of the gas. Result: Environment Temperature of the water,(T �C) � 0.5 �C Temperature of the water in Kelvin (T) , T= T �C + 273.15 Height of the gas column � 0.5 cm. *Volume of gas. Warm water 50.0 323.15 7.40 7.40 Pipe water 29.0 302.15 6.70 6.70 Water + Ice-water 6.0 279.5 6.20 6.20 Water + Ice-ethanol -4.0 269.15 5.80 5.80 *Assuming that the diameter of the tube is constant, then the volume of the gas directly proportional to the height of gas column. Evaluation: The experiment shows the relationship between the temperature of the gas and its volume at constant pressure. According to Charles's Law, at a constant pressure, the volume of gas is inversely proportional to the absolute temperature of the gas. V ?T V = kT (k is a constant) V/T = k Theoretically, when graph Volume (V) against Absolute Temperature (K) is plotted we should get a liner graph with k (the constant) as a gradient of the graph. Unfortunately, this kind of graph fails to be obtained due to some limitations. ...read more.

Conclusion

thigh The ruler is not a perfect measurement instrument to measure the level of the mercury because it has large scales and uncertainties. Replace ruler with other measurement instrument that has smaller scales and smaller uncertainties The heat from our hand (generated by our body) might affect the results of the experiment when we hold the glass tube. Avoid holding the glass tube using our hand. When we took out the gas tube out of its environment to record the height of the gas column, the room temperature will affect the reading if we take too much time to determine the reading. After we took out the gas tube out of its environment, we need to take the reading as fast as possible to avoid the room temperature from influents the reading. The unequal distribution of heat wills influent the results. We can stir the water slowly using a glass rod to distribute the heat in the water evenly. Conclusion: The gas law is mathematically related to the temperature (T), pressure (P) and volume (V). The relationships are stated by Boyle's Law, Charles Law and Ideal Gas Law. ...read more.

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