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Unformatted text preview: CHM 2046 HOMEWORK 4 Name W SEC TA
1. Given these equilibrium constant values,
2N2(g) + 02(9) 2 2N20(g), Kp = 1.2 x 10‘35 N2(g) + 202(9) 2 2NO2(g), Kp = 1.7 x 10’17 2N20(g) + 302(g) Z 2N204(g), Kp = 1.6 x 106
calculate Kp for this reaction:
N204(g) 2 2N02(g) Kp = 2. 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) NH4Ac(aq) + HCl(aq) (b) NH4F(§) + HCl(aq) (c) (NH4)ZSO4(aq) + H2C03(aq) (d) H28(aq) + NH3(aq)(excess) (e) H3PO4(aq) + NH3(aq)(excess) (f) H3PO4(aq)(excess) + NH3(aq) 3. What is the pH of 0.03 M H2CO3? pH=
4. Coca Cola has a rather low pH!! Check the list of contents to
see what acids are present. Compare these with your A/B chart. What is the strongest acid present? What other acid(s) are present? 5. Based on information in the Acid Base Handout, rank each of
these sets in order of increasing pH:
(assume 0.1 M aq solutions) lowest pH ——> highest pH (a) NH4Cl, NaAc, NaCl (b) NaCN, Na2C03, NaZSO3 (C) NH4NO3, NaHSO4, KHSO3 (d) K20, 803, 802, C02 (add these to water and see what you get). 6. Glycine is sometimes represented as NHZ—CHz—COOH but actually
exists in water at neutral pH as the zwitterion, as dicussed in
class. At low pH, the zwitterion reacts to form its conjugate
acid. At high pH the zwiterion reacts to form its conjugate base.
Show the structure of each form and indicate the total charge.
Hint: just add or remove a proton (to or from where?). Low pH Neutral pH High pH Additional Chapter 18 problems: 83, 84. ...
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- Spring '07