The Effect of Temperature on the Solubility of Carbon Dioxide in Water Under Constant Pressure

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Experiment No ____
2.0 hours

D1=2,D2=1,D3=0

The Effect of Temperature on the Solubility of Carbon Dioxide in Water under Constant Pressure

Beijing World Youth Academy
Subject: Chemistry
Student name: YeiYoung Choo
Candidate number: 000791 011

January 21, 2009 Teacher Helen Xu The Effect of Temperature on the Solubility of Carbon Dioxide in Water under Constant Pressure (Evaluated for Design)

Research Question
What is the effect of temperature on the solubility of carbon dioxide gas in de-ionised water under constant pressure?

Introduction
Temperature is known as one of the factors that affect the solubility of a gas in its solvent. Because the enthalpy of solution for gases dissolved in waters is usually negative (Reger, 2009; 482), students may hypothesize that the increase in the temperature will decrease the solubility of carbon dioxide in water and the decrease in the temperature will increase the solubility of carbon dioxide in water. In this experiment, the solubility of carbon dioxide in the water of selected temperatures—0°C, 20°C, 40°C and 60°C—will be tested by using the carbon dioxide gas prepared from the reaction between calcium carbonate and hydrochloric acid and dissolving it in de-ionised water within a gas syringe.

In regards to the temperature, the gas will not be heated directly but the temperature will be manipulated according to the temperature of the solvent, which is de-ionised water. The temperature gas will be affected when thoroughly shaking the de-ionised water of a selected temperature with it in the gas syringe and also when putting the gas syringe into the beaker in which there would be heat transfer through the wall of the barrel (which is made of glass). As for pressure, even though the pressure will not be measured to keep constant in the experiment, it will be kept controlled for each trial of dissolving carbon dioxide by filling the same amount of gas in a gas syringe and filling in the same amount of de-ionised water in addition.

Variables
Independent variable| |
Temperature under which carbon dioxide will be dissolved in water| Manipulating the temperature of the de-ionised water by heating or cooling to produce de-ionised waters of selected temperatures: 0°C, 20°C, 40°C, 60°C| Dependent variable| |

Solubility of carbon dioxide in water| Dissolve carbon dioxide in water within a gas syringe by shaking and measure the volume of undissolved carbon dioxide by pressing the plunger | Controlled variables| How to control|

Characteristic/Nature of the solvent (water)| Using de-ionised water for every trial of dissolving carbon dioxide in it| Temperature under which carbon dioxide gas is kept before dissolving in water| All gas syringes filled with carbon dioxide left under room temperature| Pressure under which carbon dioxide is dissolved in water| 30mL of carbon dioxide gas thoroughly shaken with 20mL of water within a 60mL gas syringe for every trial| Volume of water used to dissolve carbon dioxide in the gas syringe| 20mL for every trial| Condition of preparing carbon dioxide| Carbon dioxide gas produced by reacting calcium carbonate with hydrochloric acid under room temperature|

Materials required
Chemical| | |
1M Hydrochloric acid| | |
(De-ionised water)Calcium carbonate / Marble chips| | |
Material| Quantity| Uncertainty|
Digital scaleConical flaskGraduated beaker| 115| ±0.01g25ml; 150ml; ±25ml| Bung (with a hole through which a glass tube is inserted)Rubber stopper| 11| | Rubber tube (Long; approximately 30cm)Rubber tube (Short: approximately 5cm)Funnel Clamp&StandPinch clampAlcohol lampGauze heat-proof meshTripod standGlass rodBeaker tongContainerIceGlass gas syringeThermometer| 21111111111131| 60mL±1mL±1°C| Safety material| Quantity| |

Safety glasses| 1| |
Neoprene gloves| 1| |
Method
Part (a) Preparing Gas Syringes Filled with Carbon...
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