CHM 1046 Lecture Notes - Lecture 48: Ph, Electronegativity, Weak Base
Document Summary
10^-ph acidic lower than 7 basic higher than 7 neutral exactly 7 highly corrosive if ph<3 or ph<12. 5 example problems see slides 12, 13, 14 exclude liquid from. Higher ka then lower pka and stronger acid! Which of the following 0. 10 m solutions will have the highest ph? (for ka) look for smallest ka value, means weaker acid. Horizontal trend: when a is more electronegative, toward the upper right in the periodic table, ha tends to be a stronger acid (slide 18 important trends) Hf (565), hcl (431), hbr (366), hi (299) As the ha bond trends weaker, ha trends toward a stronger acid (slide 18 important trends) Hcl (strong acid) vs. h2 (not an acid at all) Electron affinity of cl (330kj/mol) much higher than h (75 kj/mol) see slide 19 for more examples) For a given element a, the acidity of awn(oh)x increases with increasing n. Oxygen is highly electronegative (second only to f)
