Lecture 12 - Very Dilute Solutions of Acid or Base Strong...

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1 Very Dilute Solutions of Acid or Base Strong acid or Base (100% Ionized): Use initial concentration in K w expression to calculate [H 3 O + ] and [OH - ] from water autoionization. For Solutions of Weak Acid or Base: Use charge balance and mass balance equations. When [H 3 O + ] 1 x 10 -6 M, this equation reduces to the usual one: ] O [H K - ] O [H ] HA [ K - ] O [H ] O [H K - ] O [H ] HA [ ] O [H K - ] O [H ] O [H ] HA [ ] ][A O [H K 3 w 2 3 o w 2 3 3 w 3 o 3 w 3 3 - 3 a + + + + + + + + + = = = x ] HA [ x ] O H [ ] HA [ ] O H [ K o 2 3 o 2 3 a = = + +
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2 8.1 The Common Ion Effect Recall that for polyprotic acids, the production of [H 3 O + ] from the first ionization greatly inhibits the second ionization. This general phenomenon is quite general, and is known as the “common ion effect”. Calculate the pH of 1.0 M HF (K a = 7.2 x 10 -4 ) in: a) Pure water b) 1.0 M NaF
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3 8.2: Buffer Solutions • Buffers resist large pH changes upon addition of an acid or base.
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Lecture 12 - Very Dilute Solutions of Acid or Base Strong...

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