CHEM1831 Lecture Notes - Lecture 12: Carbonic Anhydrase, Glycogen, Semipermeable Membrane
9 Aug 2018
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Document Summary
Substances with similar interatomic forces dissolve in each other. Polar water will only dissolve salts (ionic solids) If the loss of the strong ionic bonds is compensated by: strong hydration of the ions (solvation, the increased disorder (entropy) of the ions upon dissolving in solution. If not the salts will be insoluable in water. Polar molecules with h bonding groups tend to be more soluable in water. Dispersion forces - organise the long hydrophobic tails of the phospholipids into fluid, viscous, bilayers that exclude water. Molecules of the steroid, cholesterol stiffen the bilayers. Lipophilic - dissolves in fat but not water. Is a quantitative measure of the composition of a solution: the mass concentration = m (solute) g / v (solvent) l, the molar concentration, the molar concentration is often called the molarity of the solution. Mass % - another measure of the concentration of a solution. Mole fraction - another measure of the concentration of a solution.
