H2 Chemistry Chemical Equilibria Question!

Cre8ion SG

Hi, would appreciate if someone could answer the following question :)

When we calculate Kc of reactions that place in aqueous medium, do we take into account the concentration of water, if it is a reactant or product?

ie. CH3CO2H (l) + C2H5OH (l) <=> CH3CO2C2H5 (l) + H20 (l)

Is the Kc = [CH3CO2C2H5][H20] / [C2H5OH][CH3CO2H] ?

Thanks ! :)

UltimaOnline SG

Hi, would appreciate if someone could answer the following question :)

When we calculate Kc of reactions that place in aqueous medium, do we take into account the concentration of water, if it is a reactant or product?

ie. CH3CO2H (l) + C2H5OH (l) <=> CH3CO2C2H5 (l) + H20 (l)

Is the Kc = [CH3CO2C2H5][H20] / [C2H5OH][CH3CO2H] ?

Thanks ! :)

It depends on whether water was already initial present as a solvent (ie. in large excess), or if it functions solely as either a reactant or product.

Notice that in your particular question, it is implied that no water was initially present. Hence water here is a product, and must therefore be included in your Kc expression and formula.