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Schedule Today (3/4): Continue Chapter 8
Should have read through Section 8.7 (at least) Wednesday (3/6): Continue Chapter 8 Should have read through Section 8.8 (at least) Friday (3/8): Continue Chapter 8 Should have read all of Chapter 8 Monday (3/11): Finish Chapter 8
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Titrations with 0.100M NaOH 25.0 mL of 0.100M HCl 25.0 mL of 0.100M HC2H3O2 (Ka=1.8 x 10–5; pKa=4.74)
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Clicker Question What are the major species?
Determine the pH of a 1.00M aqueous solution of NaHCO3. Ka1 for H2CO3 = 4.3 x 10–7 Ka2 for H2CO3 = 4.8 x 10–11 What are the major species? What are the reactions in solution? Which reaction dominates?
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Clicker Question a) 6.37 b) 7.52 c) 8.09 d) 8.34 e) 10.32
Determine the pH of a 2.00M aqueous solution of NaHCO3. Ka1 for H2CO3 = 4.3 x 10–7 Ka2 for H2CO3 = 4.8 x 10–11 a) 6.37 b) 7.52 c) 8.09 d) 8.34 e) 10.32
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Polyprotic Acids: H2CO3 Ka1 = 4.3 x 10–7 Ka2 = 4.8 x 10–11 pKa1 = 6.37 pKa2 = 10.32
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Diprotic Acid Titration pH Curve
Essentially two pH curves!
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Polyprotic Acids: H3PO4 pKa1 = 2.12 pKa2 = 7.21 pKa3 = Ka1 = 7.5 x 10–3 Ka2 = 6.2 x 10–8 Ka3 = 4.8 x 10–13
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Trprotic Acid Titration pH Curve
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Polyprotic acid titration: H3PO4
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