Ch12 Worksheet

Ch12 Worksheet - I. Acids and bases: -Bronsted definition:...

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I. Acids and bases: -Bronsted definition: Acids are proton (H 1+ ) donors Bases are proton (H 1+ ) acceptors -What makes a X-H bond acidic? The hydrogen atom has to be bound to an electronegative atom. So, H -CH 3 is not acidic, but H -Cl is acidic. -Conjugate acid/base pair differ by only one proton (H 1+ ) HCl + H 2 O H 3 O 1+ + Cl 1- acid base c.acid c.base Practice problems: 1. What is the conjugate acid of each base? a) HPO 4 2- _______ b) OH 1- ________ c) NH 3 ________ d) HSO 4 1- ________ 2. What is the conjugate base of each acid? a) H 2 CO 3 ________ b) HPO 4 2- ______ c) H 3 O 1+ ________ d) HNO 2 _______ II. Relative acid/base strength: Strong acids have weak (stable) conjugate bases. How can we stabilize conjugate bases? a) The negative charge of the base is stabilized by a larger ion. H-F < H-Cl < H-Br < H-I (increasing acid strength) b) The negative charge on the base is also stabilized by electron withdrawing groups and resonance. c)
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Ch12 Worksheet - I. Acids and bases: -Bronsted definition:...

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