CHEM 001 Lecture Notes - Lecture 25: Molality, Pentane, Heptane
26 Aug 2020
School
Department
Course
Professor
Document Summary
Solutions are homogeneous mixtures of two or more substances. Whether a solution will form or not depends on the relative strengths of these three interactions. Pentane, a hydrocarbon, and water do not mix because hydrogen bonding is much stronger than london dispersion forces. Insoluble ions (s 2-, co3 2-, po4 3-) have exothermic lattice energies (strong ionic bonds) stronger solute-solute interactions than solvent-solute interactions. A solute will dissolve in a solvent if both have similar structures. Solvent molecules will attract the solute particles at least as well as the solute particles to each other. Predict whether these vitamins are water- or fat-soluble: vitamin c - water (h-bonds, vitamin k - fat (polar bonds, but no dipole moment, vitamin a - fat (one h-bond, but many ldfs) Solvent - the majority component of the solution; solution has the phase of the solvent. Solute - the minority component of the solution; becomes phase of solvent.
