4/24/2016 1 1:55 PM O 42.1/1004/18/2016 1238 PM Print il Calculator bal Periodic

Question

4/24/2016 1 1:55 PM O 42.1/1004/18/2016 1238 PM Print il Calculator bal Periodic Tabie Question 6 of 7 When an ion-selective electrode for X' was immersed in 0.0580 M XCI, the measured potential was 0.0250 V. What is the concentration of X' when the potential is 0.0400 V7 Assume that the electrode follows the Nergst equation, the temperature is at 25 C, and that the activity coefficient of X is 1. Number X0.919 There is acditional feedback available! View this feedback by bottom divider bar Click on the divider on the Incorrect bar again ta hide the additional feedback. Close Previous Explanation

Explanation / Answer

First at 0.058 M XCl

E = Eo - 0.0592 log(1/0.058)

0.025 = Eo - 0.0592 log(1/0.058)

Eo = 0.0982 V

When potential was 0.04 V

0.04 = 0.0982 - 0.0592 log(1/[X+])

[X+] concentration = 0.104 M

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