CH204_L05 - PURPOSE AND LEARNING OBJECTIVES To learn how to...

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Unformatted text preview: PURPOSE AND LEARNING OBJECTIVES To learn how to excel spreadsheet to simulate a titration. To use graphical analysis to estimate acid present as function of pH. To compare experimental results to a model simulation Experiment 5. Simulation of a Weak Acid-Strong Base Titration Curve 2 3 4 5 6 7 8 9 10 11 12 13 14 80 70 60 50 40 30 20 10 Volume NaOH (mL) 1/2 of the # of mL of NaOH at Equivalence Point 1/2 Equivalence Point. pH of solution at 1/2 Equivalence Pt. pH of solution at Equivalence Pt. Equivalence Point mL of NaOH at Equivalence Point Standard Terms for Titration Curve Weak Acid-Strong Base Titration Initial point: pH of solution containing unknown acid (HA) dissolved in known volume of water. If acid is known then K C ] [ a a 3 = + O H 5 2 3 3 3 a 10 76 . 1 ) 10 . ( ] COOH CH [ ] COO CH ][ O [H K + = = = x x 5 2 10 76 . 1 10 . x pH = log (1.3 10 3 ) = 2.88 2 3 4 5 6 7 8 9 10 11 12 13 14 80 70 60 50 40 30 20 10 Volume NaOH (mL) 1/2 of the # of mL of NaOH at Equivalence Point 1/2 Equivalence Point. pH of solution at 1/2 Equivalence Pt. pH of solution at Equivalence Pt. Equivalence Point mL of NaOH at Equivalence Point Ex: What is pH of a 0.1 M acetic acid What is the pH when 5.0 mL of 0.100 M NaOH have been added to 50.0 mL of 0.100 M acetic acid? The original number of moles of CH 3 COOH in the solution is: 0.050 L x 0.100 M = 0.005 moles CH 3 COOH Similarly, there are 5.00 x 10-4 moles of OH- due to the NaOH OH- (aq) + CH 3 COOH (aq) CH 3 COO- (aq) + H 2 O (l) The total volume is 55.0 mL....
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CH204_L05 - PURPOSE AND LEARNING OBJECTIVES To learn how to...

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