CHEM 1A03 Lecture Notes - Lecture 5: Zinc Chloride, Ionic Strength, Equilibrium Constant

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1A03
• Professor: Jeff Landry

Document Summary

Unique macroscopic properties essential to life: unusually high boiling point of liquid water at stp: bp = 100c at 1 atm (seal level) t, p. 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) Water auto-ionizaiton: water is amphoteric and conductive. Water acts as an acid and base with itself. 2h2o(l) h30+(aq) + oh- (aq) (hydronium and hydroxide are electrolyes) Kw = [h3o+][oh-} = 1 x 10-14 (25c) 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. Purified de-ionized water; ph = -log[h3o+] 7. 0. Low conductivity since [h3o+] & [oh=] = 0. 1 m.