Consider a hypothetical salt of low solubility, "MX", where M+ is a metal cation and X- is a non-metal anion.A voltaic cell was set up with a cathode containing metal "M" immersed in a solution containing M+ at a concentration of 1.00 mol L-1. The anode consisted of metal "M" immersed in a saturated solution of "MX".The measured cell voltage was 0.121 V.What is the Ksp of "MX" at 25°C ?

Question
Asked Apr 4, 2019
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Consider a hypothetical salt of low solubility, "MX", where M+ is a metal cation and Xis a non-metal anion.

A voltaic cell was set up with a cathode containing metal "M" immersed in a solution containing M+ at a concentration of 1.00 mol L-1. The anode consisted of metal "M" immersed in a saturated solution of "MX".

The measured cell voltage was 0.121 V.

What is the Ksp of "MX" at 25°C ?

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Expert Answer

Step 1

For the cell, reduction takes place at cathode and oxidation takes place at anode. Thus, the reactions taking place at the two electrodes and the net reaction may be written as:

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Step 2

Nernst equation is the equation that relates the cell potential with the concentrations of the species, temperature. It is given as:

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Step 3

Since, MX is a sparingly soluble salt (i.e. a solid), its concentration may be considered ...

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