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BCHE 395-2 2014 Weak Interactions

Ions order water into hydra2on shells water interac2on

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Unformatted text preview: ed to one another –  Due to structure (bent, sp3 tetrahedral) and electronega2ve O •  Compared to other hydrides, water has a –  High mel2ng point –  High boiling point –  High dielectric constant (can be highly polarized) –  High heat of vaporiza2on Keep and eye on bond lengths! Electric Asymmetry of water (structure) confers special proper2es 1. Oxygen atom is highly electronega5ve, resul2ng in permanently polarized dipole 2. The molecule is bent, almost in a tetrahedral arrangement δ+ H O 104.5 H o δ– δ+ Water: H- bonds •  Sum of all H bonds in water confers cohesiveness or “s2ckiness” of water •  Liquid: each molecule can form H bonds to an average of 3.4 other molecules •  Solid: can bond to itself: up to 4 molecules –  In ice, crystal lasce forms, maximizing distance between water molecules à༎ less dense than water •  It floats! Water: Interac2on with Solutes •  Water can interact with ionic solutes •  First hydra2on shell à༎ orienta2on of charges Water: Interac2on with Solutes •  Ionically stabilized compounds (salts like NaCl) dissolve in aqueous “cages of hydra2on” Water: O...
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