The electrodes in the following electrochemical cell are connected to a voltmeter as shown. The half-cell on the right contains a standard silver–silver chloride electrode (see Exercise 88). The half-cell on the left contains a silver electrode immersed in 100.0 mL of 1.00 x 10^-3 M AgNO₃(aq). A porous plug through which ions can migrate separates the half-cells.

(a) What is the initial reading on the voltmeter?

(b) What is the voltmeter reading after 10.00 mL of 0.0100 M K₂CrO₄ has been added to the half-cell on the left and the mixture has been thoroughly stirred?

(c) What is the voltmeter reading after 10.00 mL of 10.0 M NH₃ has been added to the half-cell described in part (b) and the mixture has been thoroughly stirred?

Exercise 88

A common reference electrode consists of a silver wire coated with AgCl(s) and immersed in 1 M KCl. 

(a) What is E°_cell when this electrode is a cathode in combination with a standard zinc electrode as an anode?

(b) Cite several reasons why this electrode should be easier to use than a standard hydrogen electrode.

(c) By comparing the potential of this silver–silver chloride electrode with that of the silver–silver ion electrode, determine K_sp for AgCl.

Transcribed Image Text:

-Ag(s) Voltmeter 1.00 x 10-3 M AgNO3(aq) Ag, AgCl(s)- 1.00 M KCI