HW 3 - CHM 2046 HOMEWORK 3 Name SEC TA 1 For each equation...

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Unformatted text preview: CHM 2046 HOMEWORK 3 Name SEC TA 1. For each equation, fill in the expected products [Charges!!]. 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) Z F'(aq) + H20(l) (Example) (A) (B) (CB) (CA) (b) Hso4'(aq) + H20(l) Z H3o+(aq) + N (c) 303‘2(aq) + H20(l) OH'(aq) + N (d) HSO3—(aq) + H3o+(aq) (e) NH '(aq) + H20(l) 2 (B? 2. What are the [...] and pH for 0.12 M NH4Cl? 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. [NH4+] [Cl‘] [NH3] [H3o+] = [OH'] = pH = What fact (available before you do any calculations) indicates that the shortcut should be valid in this case? 3. What is Kb for P04;3 ? Kb: Chapter 18 Study Problems: 4, 8, 15, 18, 24, 30—37, 40, 41, 46, 47, 52, 60, 61, 64—67. (Appendix C has many values of Ka & Kb.) 4. Find all [. ..] and the pH for 0.040 M Na3PO4. Hint: the approximate method will not work in this case. Check your result. [H3o+] [Na+l —3 [904 1 5. Use Ka values available in the handout to for these reactions. multiply together the K values. (a) F_(aq) (b) HAc(aq) (c) HCN(aq) + + H30+(aq) 2 [OH‘] -2 [HPO4 ] pH = find the value of K Recall that when you add equations, you If you reverse an equation, HF(aq) + H20(l) K: NH3(aq) a AC_(aq) + NH4+(aq) K: 2 CN_(aq) + HAC(aq) Ac'(aq) ...
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