Chem 15.7-15.8

Try nacl does nacl make an acidic basic or neutral

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Unformatted text preview: on of Mg(OH)2? a) b) c) d) 0.0083 M 0.0042 M 1.2 x 10- 12 M 6.0 x 10- 13 M A solu4on of Mg(OH)2 has a pH of 11.92. What is the concentra4on of Mg(OH)2? pH + pOH = 14.00 14.00 − 11.92 = 2.08 = pOH 2.08 = − log[ OH ] − a) b) c) d) 0.0083 M 0.0042 M € 1.2 x 10- 12 M 6.0 x 10- 13 M - 0.0083mol OH 1mol Mg(OH ) × = 0.0042 M Mg(OH ) 1L 2mol OH 2 − 2 Weak Bases • B + H2O ⇌ BH+ + OH- – NH3 + H2O ⇌ NH4+ + OH- • Kb = [BH+][OH- /[B] – The smaller the Kb the weaker the base – Ka * Kb = Kw • What does a WEAK BASE mean? Calculate the pH of a 1.3 M NH3 aqueous solu4on. Kb, NH3 = 1.76 x 10- 5 The acid or base proper4es of salts: • Anions in H2O tend to form basic or neutral solu4ons • Ca4ons in H2O tend to form acidic or neutral solu4ons • Ca4ons and anions are the conjugate acid or base of something and interact with H2O accordingly! • Try NaCl – does NaCl make an acidic, basic, or neutral solu4on? What would you expect? – Na+ + H2O ⇌ NaOH + H+...
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This note was uploaded on 08/27/2013 for the course CHEM 152 taught by Professor Carriemiller during the Spring '13 term at Azusa Pacific.

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