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LQs for web 3-7 to 3-9-06

LQs for web 3-7 to 3-9-06 - Tuesday In-Lecture To Do List 1...

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Tuesday 3-7-06 In-Lecture To Do List 1. Website – exam time and places 1. Bring Calculators (only approved types!) 2. Bring Buck ID – Cannot take exam without it 2. Finish Chapter 17 (up to 17.3 only) 3. Qs & LQ: Henderson Hasselbalch clarification & titration problems
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Q1. What is the pH of a solution made by combining 600.0 mL of 1.667 M acetic acid and 400.0 mL of 0.0250 M sodium acetate? (K a =1.80x10 -5 ) 2.745 2.808 2.735 1.8 x 10-5 I’m guessing 31% 20% 40% 2% 7% 1. 2.745 2. 2.808 3. 2.735 4. 1.8 x 10 -5 5. I’m guessing
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Q2. What is the pH of a solution made by combining 600.0 mL of 1.667 M acetic acid and 400.0 mL of 0.250 M sodium acetate? (K a =1.80x10 -5 ) 3.745 7.345 3.746 1.8 x 10-5 I’m guessing 24% 7% 18% 2% 48% 1. 3.745 2. 7.345 3. 3.746 4. 1.8 x 10 -5 5. I’m guessing
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Q1. use ICE table, particularly when ratio is less than 0.1. ICE table will be correct! _____________ PH 2.8082 = pH 2.7447 = H 1.5553 10 3 × = PH log H ( ) := pH pKa log x ( ) + := H b b 2 4 a c ( ) 0.5 + 2 a := pKa 4.7447 = b 0.01 = c 1.8 10 5 × = b base Ka + := pKa log Ka ( ) := c Ka := a 1 := acid 1 := Ka 1.8 10 5 := base x := x 0.01 := HH INCORRECT IN THE 10 TH PLACE AND BEYON ICE TABLE: GIVES ACCURATE (CORRECT) pH of 2.808 Note: H - is negative
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Q2. ratio is 0.1, otherwise same problem as Q1, but using HH eqn will work if you only need 2 sig figs after the decimal place of the pH. PH 3.7456 = pH 3.7447 = H 1.7964 10 4 × = PH log H ( ) := pH pKa log x ( ) + := H b b 2 4 a c ( ) 0.5 + 2 a := pKa 4.7447 = b 0.1 = c 1.8 10 5 × = b base Ka + := pKa log Ka ( ) := c Ka := a 1 := acid 1 := Ka 1.8 10 5 := base x := x 0.1 :=
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