Concentrations product versus reactant

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Jane Burgan 1C
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Concentrations product versus reactant

Postby Jane Burgan 1C » Thu Feb 28, 2019 6:27 am

Calculate the molar concentration of Y3 in a saturated solution of YF3 by using a cell constructed with two yttrium electrodes. The electrolyte in one compartment is 1.0 m Y(NO3)3(aq). In the other compartment you have prepared a saturated solution of YF3. The measured cell potential is 0.34 V at 298 K.
How do we know whether the Y(NO3)3 is the product or reactant to use in calculating Q?

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Re: Concentrations product versus reactant

Postby Chem_Mod » Thu Feb 28, 2019 6:36 pm

Since Y3+ comes from Y(NO3)3, we can conclude that the Y3+ from this yttrium nitrate is the reactants. The reason being because there really isn't any other source of Y3+, meaning that the Y3+ from this must be the reactant. Thus, the Y3+ in the saturated solution must be the products.

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