Chem_208_16_07_web - Today: Finishing Ch 16.6-16.7;...

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1 Today: Finishing Ch 16.6-16.7; Skipping 16.8-16.9 Starting Ch. 17. PS6 due Fri. March 16
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2 Acid-Base Reactions When mixing acid with base, the reaction proceeds in the direction from the stronger to weaker member of a conjugate acid/base pair. What is favored for each of the following? 1. HCl + OH - Cl - + H 2 O 2. NH 4 + + OH - H 2 O + NH 3 3. HClO 2 + NH 3 ClO 2 - + NH 4 + Right side Right side Right side
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3 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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4 Strong Acid or Base: Fully ionized-- Percent ionization always 100. Weak Acid or Base: Percent ionization increases upon dilution Percent Ionization
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5 Polyprotic Acids What is the pH of 0.10M H 2 SO 4 (aq)? What is the pH of 0.20M H 2 S(aq) ?
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6 Salt Solutions may be acidic or basic…… •N H 4 Cl NH 4 + + Cl - Acidic: NH 4 + + H 2 O NH 3 + H 3 O + What is K
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Chem_208_16_07_web - Today: Finishing Ch 16.6-16.7;...

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