CHEM 110 Lecture Notes - Lecture 1: Conjugate Acid, Acid Strength, Central Cross-Island Highway

• School: Northeastern Illinois University
• Department: Chemistry
• Course: CHEM 110
• Professor: Xu

Document Summary

Working with buffer systems, mixtures of strong and weak acids, acid/base indicators, lactic acid/lactate in foods or the human body, whether the preservative in diet sodas should be called benzoic acid or sodium benzoate It can be difficult reasoning through the dominant species in solution at various ph levels when an acid/base equilibrium is involved. Reasoning based on pka vs ph can make this easier. Taking an acid/base titration with an indicator as an example: Indicators are often solutions of weak acids, with the un-ionized (we"ll represent as hin) and ionized forms (in-) transmitting different colors of light. Phenolphthalein, for example, is colorless in its acid or un-ionized form, but it"s ionized form appears the indicator, the ph will be low at the beginning, so the phenolphthalein will be mostly in the un-ionized or protonated . As the ph increases over the course of the titration, the ph will eventually get close to the.