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Homework_3_Hints

# Homework_3_Hints - cﬁM 2046 HOMEWORK 3 DUE HWﬁWﬂk...

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Unformatted text preview: cﬁM 2046 HOMEWORK 3 DUE: HWﬁWﬂk H.‘w"5 Name SEC TA —— 1. For each equation, fill in the expected products [Chargesgll . Identify each reactant as an acid (A) or base (B), and each product as a conjugate base (CB) or conjugate acid (CA). (a) HF(aq) + OH"(aq) 2 F‘(aq) + HO(1) (Example) (A) (B) (cs) (éA) (b) HSO4'(aq) + 1420(1) :2 H3O+(aq) +' (c) SOB—2(aq) + H20(l)' 2 OH'(aq) + - Jr ~ (d) H503“(aq) + H3O+(aq) 2 ﬁnsfw?wh!"‘ m" (e) Lag-(sq) I+ 1120(1) 2 Ms 2. What are the [...] and pH for 0.12 M NH4C1? Hints: Look up the value of the appropriate Ka in on the'A/B handout. Use the "shortcut" formula at the bottom of the handout. NHqC((ﬂf7 is anesH)’; "/qu "J 6’ ad) “"5 [NH4+] = . [NH3] = [cl'] = II [H3o+1 = ' [OH‘] 5 - pH What fact (available before you do any calculations) indicates that the shortcut should be valid in this case? 3‘ What is Kb f°r P04’3 ? ham» "an (and) LJ' show (low +9 {-14 Hi: ash-5 (Jaﬂf‘t iii 'f‘l! ‘hhﬂﬂlllllf'-., - Kb = ‘ 4.'Find all [...] and the pH for 0.040 M Na3PO4. Hint: the [H3°+1 = _.________ [OH'] = [Na+1 = [3904'2] = [904‘3] = pH = 5. Use Ka values available in the handout to find the value of K for these reactions. Recall that when you add equations, you multiply together the K values. If you reverse an equation, ... (a) F‘(aq) + H30+(aq) 2 HF(aq) + 320(1) r1231". “9m nW‘FWk. if, ma'Fh-fg Kt“ K- (b) HAc(aq) + NH3(aq)' 3 Ac‘(aq) + NH4+(aq) A" 5 f- K} awaJeJ are v; Ho (MILJIQVL‘ (c) HCN(aq) + Ac'(aq) CN'(aq) + HAc(aq) .3 (— ...
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Homework_3_Hints - cﬁM 2046 HOMEWORK 3 DUE HWﬁWﬂk...

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