CHEM 1120 1nd Edition Lecture 12 Outline of Last Lecture I Radiation Units and Doses a Gray Gy b Rad c Sievert Sv d Rem e Radon Rn II Begin Chapter 16 Acids and Bases Not on Exam 1 III Acids and Bases A brief review a Arrhenius acid and base definition IV Bronsted Lowry Acid Base Definition a Conjugate Base Pairs b Strong Acids and Bases Outline of Current Lecture I Acid Base Reactions a Autoionization of water b pH equation c Acid disassociation constant II Strong Acids and Bases a Strong acids b Strong bases c Weak acids Current Lecture These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III IV Acid Base reactions a Equilibrium will favor the reaction that moves the proton to the stronger base b Autoionization of water i Water is amphoteric in pure water a few molecules act as bases and a few act as acids ii Water is a very weak electrolyte iii Kw H OH 1 x 10 24 at 25 degrees Celsius 1 Called ion product constant for water c pH log10 H i 2 significant digits 2 decimal places ii pOH log OH iii pKw pH pOH 14 iv pH 7 acidic pH 7 basic d Acid dissociation constant i Ka H A HA ii Only works for weak acids Strong Acids and Bases a Strong acids i Strong electrolytes and exist totally as ions in aqueous solutions b Strong bases i Substances completely dissociate in aqueous solution c Weak acids i Most acids ii Memorize 7 common strong acids iii Ka is a measure of acid strength 1 Smaller k weaker acid 2 For all acids k 1 3 Calculations using Ka are similar to those using Keq in Chapter 15 iv Must use ICE table to calculate concentrations in weak acids
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