How would one find the equilibrium constant of the solution if the absorbency is 0.389 and...

How would one find the equilibrium constant of the solution if the absorbency is 0.389 and the initial concentrations are .1M and 1E-4M for two reactants?

Expert Solution

First of all, you cannot find equilibrium constant of a solution. Equilibrium constant is defined for a chemical reaction, which, by the way, cannot be directly found from absorbance.

I'm assuming that you're talking about the absorbance of the product. If that is the case, then you can calculate the concentration of the product using Beer-Lambert's law () , provided you the the molar extinction coefficient () and path length of the sample cuvette.

Once you've got the concetration for all the species in a reaction, you can calculate the equilibrium constant.

Suppose the reaction is -

where A and B are reactants, and C is product, then the equilibrium constant (K_eq) is defined as -

where the sqaure brackets represent concentration.

I hope your doubt is clear. Please ask in the comment section if you have any more doubts.

queen_honey_blossom answered 2 years ago

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