CHM-3120 Study Guide - Midterm Guide: Buffer Solution, Phenolphthalein, Weak Base
29 Jun 2017
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>automatic titrators: expensive, generate curves and calculates end points etc. Acid-base indicators: typically organic cmpds that are also weak acids/bases. >some exist w/ 3 diff colors ex: thymol blue. >equivalence pt. ph of soln must occur within close proximity, at least, of ph where indicator changes color. >indicator error: indicators interacting w/ species in the soln and affecting ph avoided by use of extremely dilute indicator and only 1-2 drops. *activity = effective [] of solute in soln. *if says find solubility of x in a soln of ph y, assume in buffer. *never need to derive eqns for this class. *more than one pertinent rxn/equilibrium often competing ones. 5)# of eqns now should equal # of unknowns. Basically using all possible equilibria, mass, and charge balance eqns to solve for our unknowns via simplifying each eqn to be in terms of the same unknown then plugging in ksp.
