Chapter 15 Lecture 3

Chapter 15 Lecture 3 - Chapter 15 Lecture 3 You can buy...

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Chapter 15 Lecture 3 You can buy salts of acids. NaCl(s) NaNO 3 (2) Na 2 CO 3 (s) NaF(s) KOCl CH 3 COONa (s) What happens when these are dissolved in water? Salts to strong acids dissolve to make neutral solutions Salts of weak acids dissolve to make basic solutions.
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Watch this: Weak acid in water CH 3 COOH + H 2 O H 3 O + + CH 3 COO - 5 3 3 3 10 8 . 1 ] [ ] ][ [ - - = = X COOH CH COO CH O H Ka Then for the conjugate base CH 3 COO - + H 2 O CH 3 COOH + OH - 10 3 3 10 6 . 5 ] [ ] ][ [ - - - = = X COO CH COOH CH OH Kb H 2 O + H 2 O H 3 O + + OH - Note that Kw = KbKa = 1 X 10 -14 Or Kw = pKa + pKb = 14 Because of this relationship only Ka’s are listed in tables. If you are given the salt of the conjugate acid, you are suppose to figure out the Kb. What is the pH of an 0.8 M KOCl solution?
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KOCl → K + + OCl - OCl - + H 2 O HOCl + OH - Ka for the acid HOCl from table is: Ka = 2.9 X 10 - 8 Kb = Find pH by finding pOH
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Another big class ion salts are hydrohalide salts of weak bases. Amine compounds are the biggest group
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Chapter 15 Lecture 3 - Chapter 15 Lecture 3 You can buy...

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