Chem_215_Lecture_9_BW - Very Dilute Solutions of Strong...

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1 1 Very Dilute Solutions of Strong Acid or Base So far…. In acid solutions, the [H 3 O + ] from the autoionization of water was negligible compared to that from the acid. In base solutions, the [OH - ] from the autoionization of water was negligible compared to that from the base. However, in very dilute acid or base solutions, this may not be the case. What is the pH of a 1.0 x 10 -8 M HCl Solution?
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2 2 Salt Solutions NH 4 + + H 2 O NH 3 + H 3 O + ) NH ( K K ) NH ( K 3 b w 4 a = + K a K b = K w = 1.00 x 10 -14 at 298 K (for conjugate acid/base pairs)
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3 3 Salt Solutions may be acidic or basic…… •NH 4 Cl NH 4 + + Cl - Acidic: NH 4 + + H 2 O NH 3 + H 3 O + What is K a for NH 4 + ? •N aNO 2 Na + + NO 2 - Basic: NO 2 - + H 2 O HNO 2 + OH - What is K b for NO 2 - ? K a K b = K w = 1.00 x 10 -14 at 298 K
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4 4 Polyprotic Acids What is the pH of 1.0M H 2 SO 4 (aq) ?
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5 5 Carbonic Acid (H 2 CO 3 ) H 2 CO 3 (aq) + H 2 O (l) H 3 O + (aq) + HCO 3 - (aq) K 1 = 4.3 x 10 -7 HCO 3 - (aq) + H 2 O (l) H 3 O + (aq) + CO 3 2- (aq) K 2 = 4.8 x 10 -11
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Chem_215_Lecture_9_BW - Very Dilute Solutions of Strong...

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