25 Gas Solubility &amp; Concentrations

# 25 Gas Solubility &amp;amp; Concentrations - What do you...

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1 1 What do you predict? As the gas pressure increases, its solubility in water _____________. A) increases. B) is unaffected. C) decreases. Pressure 2 Henry’s Law of Gas Solubility A dynamic equilibrium is established between molecules dissolved in a liquid and molecules in the vapor phase above the liquid. Rate of escaping = Rate of entering If the pressure of the vapor is increased, the frequency of collisions with the surface increases, so the rate of entering increases, and more molecules dissolve in the liquid. Henry’s Law expresses the relationship between solubility and gas pressure in terms of a Henry’s law constant, k H . k H units = M/torr, M/mm Hg, M/atm S g = k H P g

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2 3 This Week’s Workshop Activity: Acidifying the World’s Oceans #15 in Solving Real Problems with Chemistry Take your book to class. Before beginning this activity, you should be able to Identify conjugate acids and bases Solve acid-base equilibrium and buffer problems Correctly use the Henderson-Hasselbalch eq. Determine gas solubility using Henry’s law Apply Dalton’s law of partial pressures 4 Review: Dalton’s Law of Partial Pressures For a mixture of ideal gases, each gas behaves independently of all the others. Consequently P g V=n g RT for each gas, g P total = P g1 + P g2 + P g3 + …. And total g total g n n P P g total V or = V
3 5 The issue with ocean pH. The partial pressure (concentration) of CO

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## This note was uploaded on 02/13/2011 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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25 Gas Solubility &amp;amp; Concentrations - What do you...

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