If the concentration of Mg2+ is changed from 1.0 M to 0.1 M in the galvanic cells above, what will happen to the observed cell voltages in galvanic cells 2 and 3?

If the concentration of Mg2+ is changed from 1.0 M to 0.1 M in the galvanic cells above, what will happen to the observed cell voltages in galvanic cells 2 and 3? Correct Answer The voltage in both galvanic cells 2 and 3 will increase.

As discussed in Example 13.6 and the Solution for Exercise 13.5, if E°cell is positive and the product concentration is larger than the reactant concentration, the voltage will decrease toward zero. In this case the product concentration is less than the reactant concentration, so the voltage will increase. This will happen in both cells 2 and 3.
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