CH302 Chapter 7 notes part 4 answers

CH302 Chapter 7 notes part 4 answers - Examples to just...

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1 Examples to just give answers to: Calculate the hydrolysis constants for the following anions of weak acids (i.e., find K b for these acid’s conjugate bases) 1. The fluoride ion, F-, the anion of hydrofluoric acid, HF. For HF, K a =7.2 x 10 -4 . [] FH OH F O H K HF OH F K K K 2 b w a for HF b −− + + == = × × 10 10 72 10 14 10 14 4 11 . . . 2. The cyanide ion, CN-, the anion of hydrocyanic acid, HCN. For HCN, K a = 4.0 x 10 -10 . 5 10 14 b HCN for a w b - 2 10 5 . 2 10 0 . 4 10 0 . 1 K K K CN OH HCN K OH + HCN O H CN × = × × = = = + Examples to just give answers to: Example to do in class: “Clorox”, “Purex”, etc., are 5% sodium hypochlorite solutions. Calculate [OH - ], pH and percent hydrolysis for the hypochlorite ion in 0.10 M sodium hypochlorite, NaClO, solution. We already found K b for the anion is 2.9 x 10 -7 M M M 0.10 0.10 0.10 ClO Na NaClO O H in 100% ~ (s) 2 + ⎯→ + We know the initial concentration of the two ions present from this salt of a weak acid and a strong base.
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This note was uploaded on 10/23/2010 for the course CH 51060 taught by Professor Sutcliffe during the Fall '10 term at University of Texas.

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CH302 Chapter 7 notes part 4 answers - Examples to just...

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