20.Titrationcurves

20.Titrationcurves - Acids Lesson 8 Titration Curves...

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Unformatted text preview: Acids Lesson 8 Titration Curves Titration Curves A titration curve is a graph of the pH changes that occur during an acid-base titration versus the volume of acid or base added. The equivalence point is the end of a titration where the stoichiometry of the reaction is exactly satisfied, or moles H = moles OH . Choosing an Indicator When you choose an indicator, you must pick one so that the transition point of the indicator matches the equivalence point of the titration. Rule of thumb Salt Equivalence Point 7 9 5 Neutral Basic Acidic 1. Titration Curve: Strong Acid and Strong Base HCl + KOH KCl + HOH neutral salt Indicator pH = 7 Bromothymol Blue 50 mL of 0.10 M KOH is added to 25 mL of 0.10 M HCl We start here The pH of 0.10 M HCl is 1.0 0.10 M KOH The pH of 0.10 M KOH is 13.0 pH 14 7 0.10 M HCl Neutral Salt pH = 7.0 0 0 25 Volume .10 M KOH added 50 2. Titration Curve: Weak Acid and Strong Base is added to We end here pH = 3 pH 14 We start here pH = 14 Basic Salt pH = 9 1.0 M KOH 7 0 0 10 Volume 1.0 M HCN added 20 1.0 M HCN 3. Titration Curve: Strong Acid and Weak Base 3 pH 14 7 1.0 M NH pH 10 Acid Salt pH 5 0 30 Volume 1.0 M NH3 added 60 0 1.0 M HCl pH = 0 4. Match the Curve with the Reaction pH 14 7 0 0 25 Volume .10 M KOH added 50 A. B. C. 3HCl + Al(OH)3 HCl + KOH HCN + KOH AlCl3 + 3HOH KCl + HOH KCN + HOH 5. Match the Curve with the Reaction pH 14 7 0 0 30 Volume 1.0 M NH3 added 60 A. B. C. 3HCl + Al(OH)3 HCl + KOH HCN + KOH AlCl3 + 3HOH KCl + HOH KCN + HOH 6. Match the Curve with the Reaction pH 14 7 0 0 30 Volume 1.0 M NH3 added 60 A. B. C. 3HCl + Al(OH)3 HCl + KOH HCN + KOH AlCl3 + 3HOH KCl + HOH KCN + HOH ...
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