CHEM 1100 Study Guide - Final Guide: Ionic Compound, Ph Meter, Lipophilicity
23 Apr 2016
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Document Summary
Protic (ha) dissociate partially or completely to form h+ and a-, the polar bond ha is very polar, stabilizing anions well by hydrogen bonding. Aprotic solvents exhibit large dipole moments but do not dissociate. They stabilize cations via their dipole (negative), but can also coordinate with a cation (via a covalent bond). If hsolute + hsolvent > hmix then the compound may still dissolve if the entropy term (t s) is bigger than the unfavourable dh term. It is not easy to separate hsolvent and hmix. When the solvent is water hsolvation is known as hhydration. For ionic solids, the solvent interacts with separated cations and anions; each ion has a solvation shell. If hsoln ~ 0, t s can drive the compound to dissolve. Sgas = khpgas (solubility of a gas in m due to its partial pressure/k value represents solvent-gas interactions) % by mass: mass solute/mass solution x 100%
