CHEM 1A03 Lecture Notes - Heat Capacity, Purified Water, Strong Electrolyte

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1A03
• Professor: David Brock

Document Summary

Energetically favourable h2o-solute interactions: h bonding (dipole-dipole) with solutes (o-h, n-h, c=o, +/- ion-dipole forces. Encompassing solutes via these interactions since pos / neg dipoles attract to stabilize. Ion hydration, sodium pumps, ion transport eg. sodium ion. Protein folding, activity, and drug binding eg. has (human serum abumin) 2h2o(l) h30+(aq) + oh- (aq) (hydronium and hydroxide are electrolyes) Kw = [h3o+][oh-} = 1 x 10-14 (25c) Water auto-ionizaiton: water is amphoteric and conductive. Water acts as an acid and base with itself. Water is a pure liquid so it has a value of 1 so don"t inclue it in equilibrium expression. Kw is always obeyed, regardless of when stresses are added. Low conductivity since [h3o+] & [oh=] = 0. 1 m. Degree of ionization of an electrolyte in aqueous solution , tells how strong the electrolyte is. Strong electrolyte (ionic) eg. sodium chloride, intravenous supply of electrolytes: nacl na+ (aq) + cl- (aq)