Q for the concentration cell


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Sophie Krylova 2J
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Q for the concentration cell

Postby Sophie Krylova 2J » Sat Mar 17, 2018 8:41 am

In example 14.10 it says that to find Q you need to divide left side by the right side concentration. Why isn’t it the other way around - like products over reactants and hence right over left?

Sarah_Stay_1D
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Re: Q for the concentration cell

Postby Sarah_Stay_1D » Sat Mar 17, 2018 9:17 am

Sophie Krylova 2J wrote:In example 14.10 it says that to find Q you need to divide left side by the right side concentration. Why isn’t it the other way around - like products over reactants and hence right over left?


The left side (anode) is actually the product. In a concentration cell the lower concentration is always the product. Therefore your reaction would be Ion (aq, higher concentration) -----> Ion (aq, lower concentration). So you Q would then be [lower concentration]/[higher concentration].


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