Chpt%2018-2

Chpt%2018-2 - Weak Acids/Bases 18.4 – 18.6 Last time •...

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Unformatted text preview: Weak Acids/Bases 18.4 – 18.6 Last time • General equations: HA( aq ) + H 2 O( l ) H 3 O + ( aq ) + A- ( aq ) K a For weak bases B( aq ) + H 2 O( l ) BH + ( aq ) + OH- ( aq ) K b Strong bases are usually BOH B + + OH- Weak acids and bases disassociate only partly, they reach equilibrium Weak acids • Consider the weak acid: HCO 2 H K a = 1.8*10-4 If someone dissolves 4.8 g of HCO 2 H in 85 mL of water. What will be the pH of the water? Things you’ll need: Disassociation reaction Equilibrium Equation Equilibrium Table Percent disassociation [ ] [ ] initial dissoc HA HA d Dissociate Percent = Solve for the percent dissociated for: HCO 2 H K a = 1.8*10-4 If the initial concentration is 1.227 M (same as previous problem at start of class) If the initial concentration is 0.100 M More Equilibrium • If 0.85 M HClO 2 solution has a pH of 1.04, what is the K a for HClO 2 • You can check your answer with the appendix in the back Polyprotic acids Conceptually: • Poly means many: H...
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This note was uploaded on 11/30/2011 for the course CHEM 1212 taught by Professor Dockery during the Fall '08 term at Kennesaw.

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Chpt%2018-2 - Weak Acids/Bases 18.4 – 18.6 Last time •...

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