Concept Test: Henry's Law

Internet Concept Test Chemistry 22

Prof. J. C. Baird

Concept Test Solutions

Topic: The Solution of Gases in Liquids and Solids;
Equilibrium and Non-Equilibrium Questions
Colligative Properties

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Question 1

Carbonated water at 35F (275K) pressurized at 1.5 atm contains a certain amount of dissolved CO2. If allowed to rise to room temperature the amount of dissolved CO2:

a. Decreases.
b. Increases.
c. There is insufficient information about the dissolved gas.

Reason for Answer:

Question 2

We have a two liter bottle of soda that has been completly filled-that is, there is no space between liquid and the cap. The bottle is filled with a soft drink and carbon dioxide at one atmosphere pressure at room temperature is in equilibrium with the liquid.

1. If the bottle is dropped, or vigoriously shaken, and then opened, bubbles will:

a. "explode from the bottle.
b. quietly evolve toward some equilibrium state.
c. Nothing will happen.

Reason for Answer:

Question 3

Deep sea divers are interested in this question because of the solubility of nitrogen in blood and its evolution (the bends) on their rising from a depth in the ocean to the surface.
If the Henry's law constant for nitrogen is and that of helium is then for a given pressure the concentration of helium in the blood will be

a. 165% that of nitrogen.
b. 61% that of nitrogen.
c. equal to that of nitrogen.

Reason for Answer:

Question 4

A recent chemistry textbook states: "Henry's Law holds quantitatively only for gases that do not interact chemically with the solvent. It does not work perfectly for NH3, for example, which gives small concentrations of and in water, or for , which reacts with water to form carbonic acid." While in the text of a Fig. showing bottles of soda water, it is stated that "..The greater the partial pressure of over the soft drink in a bottle of soda, the greater the amount of dissolved..." And in a table of Henry's Law constants it is stated "The Henry's Law constant for is "

The most appropriate answer reconciling these statements is:

a. Strictly speaking, Henry's Law cannot, and should not, be applied to CO2.
b. Henry's Law can approximately be applied since the deviations are small.
c. Measured solubility data must be used.

Reason for Answer:

Question 5

In the hydrothermal vents on the ocean floor water is in it's critical region. The critical temperature for pure water is Tc = 374 C. Ions (, , etc.) and molecules (, , , etc) dissolved in sea water would be expected to

a. lower Tc.
b. raise Tc.
c. have no change on ocean water.

Reason for Answer:

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