Section lll 230 Sp15 PREP6 Blank 3) Consider the galvanic below. The two half re

Question

Section lll 230 Sp15 PREP6 Blank 3) Consider the galvanic below. The two half reactions are written below or next to the cell shown eakers. (circle the best answer in each of the three boxes for parts ac) a) What is the direction of electron flow? c) The concentration of b) The half cell shown NO3 in the beaker on on this side (the left) is the this side (the right) will anode cathode) M NaNO pb decrease 100 mLof solution that is stay the same 1M NaoBr as the reaction proceeds. 1M NaB 100 mL of 0.5M Pb(NO32 pH Pbes, Pb 2 2e. Bro H20o) 2e- Br d) The cell is constructed as shown above. AE 1.106 v. What is the AGoot the cei? AGOz How will the following changes affect the cell potential AE? ite in increase, decrease, OR no change in each blank. e) HBro is added to the bromine half cell f) the pH in the bromine half cell is increased: g) 50 mL of water is added to each beaker: 12 h) the salt bridge is changed to 1M NaBr:

Explanation / Answer

a) the direction of flow of electrons is <------

b) The left side reaction shows reduction so it is cathode

c) Conc of NO3- will increase

d) we know that

DeltaG = -nFE0

Here n = change in number of electrons = 2

DeltaG = - 2mol eX 96458C/mol e X 1.106V = - 213.36 KJ

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