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CW10-NIE - HAc or HC 2 H 3 O 2 is really CH 3 COOH(c...

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CHM 2046/Myers Worksheet 10 January 27, 2010 1. More Applications of the Acid-Base Table, and the equation: Kb = Ka Kw (a) Given a Ka, you can calculate a Kb. (b) The weaker the A, the stronger the CB. (c) The CB of a SA is a VWB: Kb = e arg l 10 x 0 . 1 14 - = (very small) 2. Predicting if an A/B reaction is “appreciable” (shifts to the right, or K >> 1). Review Homework 3, problems 5 (b) & (c). Give the net ionic equation for the principal (large shift) reaction, if any, occurring when the following are mixed. NAR = no appreciable reaction is a possible answer. (a) HAc(aq) + NH 3 (aq) (b) HCN(aq) + Ac-(aq) (c) HCl(aq) + NaF(aq) (d) H 2 SO 3 (aq) + NH 3 (aq) (excess) (e) H 2 SO 3 (aq) + NaAc(aq) (excess) (f) H 2 SO 3 (aq) (excess) + NH 3 (aq) (g) NH 4 HCO 3 (aq) + NaAc(aq)
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3. The Classic pH Experiment. Sample _______________________ pH = ______________ 4. The Molecular Structure of Acids and Bases. (a) Oxyacids are really hydroxy acids. H 2 SO 4 is really O 2 S(OH) 2 (b) Organic acids have a carboxyl ( –COOH ) group.
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Unformatted text preview: HAc or HC 2 H 3 O 2 is really CH 3 COOH (c) Organic bases have an amine ( –NH 2 ) group. CH 3 NH 2 is a variation of NH 3 (c) Amino acids are bifunctional . NH 2-CH 2-COOH 5. Calculate [H 3 O + ] for 0.010 M H 2 SO 4 – an exceptional case (Ka2 is not so small). (a) The first proton in H 2 SO 4 is strongly acidic, so the first reaction goes essentially to completion: H 2 SO 4 + H 2 O H 3 O + + HSO 4-, [H 3 O + ] (from this) = _____ (b) The second proton does contribute significantly to [H 3 O + ]. We must solve for how much H 3 O + is present after the second ionization (Ka2) reaches equilibrium. The [H 3 O + ] produced from the first ionization is present “initially” for this reaction. HSO 4-(aq) + H 2 O ( l ) H 3 O + (aq) + SO 4-2 (aq) , Ka2 = 0.010 I C E [HSO 4-] = _____________ [SO 4-2 ] = _______________ [H 3 O + ] = ______________ pH = _______________ b = _____________...
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