BIOL 1201 Lecture : Lecture 4
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Readings: pgs 46-63 in campbell biology 9th ed. Mastering biology: on-line homework 1, 2 (due 10 am, before class) Water is an excellent solvent for ionic or polar molecules (see figs. Mole (mol) - sum of the atomic weights (mass numbers) in daltons = grams. Calculating molarity - molar concentration (mol / l) Dissociation of water molecules and ph: h2o can dissociate. Rare in pure water, dissociation occurs: in pure h2o, concentration of h+ = oh-, h+ and oh, h+ and oh- balance. Questions: describe the bonding of the atoms that make up a molecule of water. How do you determine the molecular weight or mole weight of a compound: the molecular weight of sucrose is 342 grams per mole. a. How many grams would you need to add to one liter (l) to make a 1. 0 m solution? b. What are the products of dissociation in water: define the terms acid, base and give an example of each.
