26 Gas Solubility & Concs

26 Gas Solubility & Concs - Why is AgCl insoluble and...

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1 Why is AgCl insoluble and NaCl soluble in water? Last time we concluded: AgCl has a significantly larger enthalpy of solvation than NaCl due to a larger lattice energy. Use the following data to explain why AgCl has a larger lattice energy than NaCl. Species Electro- negativity Ionic Radius Predicted Bond Length* Actual Bond Length Na + 0.9 102 pm Ag + 1.9 115 pm Cl 3.0 181 pm NaCl 283 pm 282 pm AgCl 296 pm 278 pm *Predicted Bond Lengths = Sum of the Ionic Radii 2 Compared to NaCl, AgCl has the larger lattice energy, which means a stronger bond in Ag-Cl, because _______ (A) AgCl is an ionic compound and NaCl is not. (B) The AgCl ions have larger charges so the attraction is greater. (C) The ionic radius of Ag + is larger so the electrons can reach out more strongly. (D) AgCl has more covalent character. (E) NaCl has more covalent character. What is your hypothesis? Evidence: (1) (Cl) – (Ag) = 1.1 (ionic cmpds  >1.9) (2) AgCl bond length < sum of ionic radii, indicating bond is stronger and not 100% ionic
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3 What do you predict? As the gas pressure increases, its solubility in water _____________. A) increases. B) is unaffected. C) decreases. Pressure 4 Today’s To Do Calculate the change in ocean pH caused by increased levels of carbon dioxide in the atmosphere.
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5 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.
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This note was uploaded on 03/29/2010 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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26 Gas Solubility & Concs - Why is AgCl insoluble and...

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