CHEM 1E03 Chapter Notes - Chapter 6: Lattice Energy, Reaction Quotient, Strong Electrolyte

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1E03
• Professor: David Brock

Document Summary

Concepts: review ib notes, precipitation reactions, dynamic equilibrium, relationships involving equilibrium constants, altering equilibrium conditions: le ch telier"s principle, equilibrium calculations: some illustrative examples. The reaction quotient, q: predicting the direction of net change. Water: water is a polar molecule and this property allows it to solvolyze ions. The polarity of water determines what molecules, such as dichlorodiphenyl-trichloroethane (ddt), tend to accumulate within an organism, as opposed to those which will pass through them. For example, if gas state ions like sodium and chloride are surrounded by water, energy will be released. The negative dipole of water is oriented towards the sodium ions and the positive dipoles of water are oriented towards the chlorides ions. Energy is released when gas state ions come together to form a solid lattice. This latter energy is known as lattice enthalpy. If the solvation enthalpy is greater than the lattice enthalpy, a solid will dissolve in water.