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Unformatted text preview: CHM 2046 HOMEWORK 8 Name SEC TA
1. What reaction should take place when the following are mixed? Use the E° table. Give a balanced net ionic equation and
calculate the E° for each reaction. (NAR is a possibility.) (a) F2(g) + H20 E° =
(b) Ag(s) + HNO3(aq)
(c) Ag(s) + HCl(aq)
(d) Fe(s) + HCl(aq)
(e) H2(g) + 02(9) [in basig solution]
2. The lead storage battery is described in the text, pages 733—
734. The proper net ionic equation for this would be:
Pb + Pbo2 + 2804‘2 + 4H+ ——> zpbso4 + 2H20 (a) What is the effect (I=increase, D=decrease, or S=same) on
each of these as the cell discharges? [so4‘2] = , pH = , nPb = , [Pb02] = n — —.
, PbSO4 _ , E _ (b) Several commercial products have been offered to the public to increse the E of the lead storage battery. What might such a
product contain? Chapter 21 Study Problems: 14—18, 20, 27, 29, 31, 33, 45, 47,
53(a), 54(a). 3. List each of these metals under its appropriate activity type,
based on the E° values shown in Appendix D, text page 829:
Ba, Cd, Co, Hg, Mn, and Sn Very Active Active Moderately Active Inactive 4. The voltaic cell shown is a possible design for an electronic
pH meter, in that the actual cell E depends on [H3O+]. (a) Write out (under each _ '“W‘M*~m~-_
half cell) the electrode Hﬁg) V _ y
reactions, and give below the (lgyo . W overall cell equation. (b) Indicate with arrows the. ' ‘fa
' a direction of motion of the
ions and electrons as the a
cell reacts spontaneously. Rt (c) mark the electrodes as + a _
or — and cathode or anode. ‘6? <:> (d) What is the standard cell Hkh M)
potential, E°? (e) Calculate the actual cell potential, E, if the unknown [H3O+]
is 1.0x10‘4 M. E: (f) If [H+] remains a variable, then for this cell: E = A + B‘pH.
What are the values of the constants A and B? ...
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This note was uploaded on 03/27/2012 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.
- Spring '07