Notes on Quiz 4 : Please have a look at the past quizzes. 1. Given solutions you should be able to decide which has the lowest pH or highest pH. Lowest pH corresponds to the one with the highest [H + ] conc: strongest acid in largest conc. 2. Given K a ’s or p K a get which is the strongest or weakest acid: strongest acid has largest K a or smallest p K a . Analogous case with bases. 3. Decide which salt solutions will be acidic, which basic, which neutral. 4. Write the acid ionization of hydrated cations. 5. Use the equation K a (HA) × K b ( A-) = K w or p K w = p K a (HA) + p K b ( A-) 6. You should be able to write formulas of conjugate acids and bases: the conjugate acid has one H more and charge one more, while conjugate bases have one less H and charge one less. 7. Decide on the basis of structure which species of more acidic or basic. For oxoacids, Substitution of central atom with more electronegative groups increases acidity, substitution with electron repelling groups decreases acidity. The reverse is true for basicity. Often comparison is possible in terms of
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This note was uploaded on 04/17/2008 for the course CHEM 173 taught by Professor Canagaratna during the Spring '08 term at Ohio Northern University.