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A Sodium Selective Electrode Increased in Voltage by 59

Question 18

Multiple Choice

A sodium selective electrode increased in voltage by 59.16 mV when the sodium cation concentration was increased by a factor of 10.A S2− selective electrode measured a decrease of 29.58 mL when the sulfide concentration increased by a factor of 10.Why?
I Cations always increase the measured potential by n × 59.16 mV where n is the charge on the cation.
II Anions always decrease the measured potential by n × 59.16 mV where n is the charge on the anion.
III Cations always increase the measured potential by A sodium selective electrode increased in voltage by 59.16 mV when the sodium cation concentration was increased by a factor of 10.A S<sup>2</sup><sup>−</sup> selective electrode measured a decrease of 29.58 mL when the sulfide concentration increased by a factor of 10.Why? I Cations always increase the measured potential by n × 59.16 mV where n is the charge on the cation. II Anions always decrease the measured potential by n × 59.16 mV where n is the charge on the anion. III Cations always increase the measured potential by where n is the charge on the cation. IV Anions always decrease the measured potential by where n is the charge on the anion. A) II and III B) III and IV C) I and II D) I and IV E) None of the statements explain the behavior. where n is the charge on the cation.
IV Anions always decrease the measured potential by A sodium selective electrode increased in voltage by 59.16 mV when the sodium cation concentration was increased by a factor of 10.A S<sup>2</sup><sup>−</sup> selective electrode measured a decrease of 29.58 mL when the sulfide concentration increased by a factor of 10.Why? I Cations always increase the measured potential by n × 59.16 mV where n is the charge on the cation. II Anions always decrease the measured potential by n × 59.16 mV where n is the charge on the anion. III Cations always increase the measured potential by where n is the charge on the cation. IV Anions always decrease the measured potential by where n is the charge on the anion. A) II and III B) III and IV C) I and II D) I and IV E) None of the statements explain the behavior. where n is the charge on the anion.


A) II and III
B) III and IV
C) I and II
D) I and IV
E) None of the statements explain the behavior.

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