CHEM 142 Lecture Notes - Lecture 15: Nitric Acid, Stoichiometry, Hydrogen Telluride

• School: Emory University
• Department: Chemistry
• Course: CHEM 142
• Professor: Mulford Douglas

Document Summary

17. 1 acids and bases: the who what when where and why. Back in chem 141 we talked about the difference between ionic and covalent compounds and mentioned that ionic compounds dissociate when they dissolve in water and that covalent compounds do not they stay intact when dissolving (think sugar, ethanol, etc. ). There is a class of covalent compounds that does dissociate when dissolved in water acids. Historically, the first definition of an acid and base came from the swedish chemist svante arrhenius for which he won the 1903 nobel prize. An acid is a compound that when dissolved in water the hydronium ion concentration (h+(aq)) increases. Base: ch3cooh(l) h+(aq) + ch3coo(aq) acid. The arrhenius definition is useful in many situations, but has trouble with bases that do not contain an. Oh- anion (like ammonia) and requires the reaction to be taking place in water. A more general definition that deals with these issues is the br nsted-lowry definition.