1. Consider the cell: Zn/Zn 2+ (1.00M) // Ag + (0.860 M) / Ag Calculate the init

Question

1.

Consider the cell:

Zn/Zn 2+ (1.00M) // Ag + (0.860 M) / Ag

Calculate the initial cell potential.

Hint: This is not at standard conditions

2.

Consider the cell:

Zn/Zn 2+ (1.00M) // Ag + (0.860 M) / Ag

Calculate the cell potential after the cell has operated long enough for the [Zn 2+ ] to have changed by 22.0%

3.What is the pH of a solution obtained by mixing 30.00 mL of 0.250 M HCl and 30.00 mL of 0.125 M NaOH?

4.What is the pH of a solution that is 0.50 M in sodium acetate and 0.75 M in acetic acid? (Ka for acetic acid is 1.75 x 10 -5)

5.Calculate the pH of a solution prepared by mixing 15.0 mL of 0.50 M NaOH and 30.0 mL of 0.50 M benzoic acid solution. (Benzoic acid is monoprotic and has a Ka of 6.5 x10 -5)

Explanation / Answer

Ag+(aq) + e– Ag(s) +0.80

Zn2+(aq) + 2e– Zn(s) –0.76

E°Cell = Ered - Eox = 0.80 + 0.76 = 1.56 V

Ecell = E°cell - 0.0592/n*log(Q)

Ecell = 1.56 - 0.0592/2*log(1/0.86) = 1.5580

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