This was the question asked in our chemistry exam:
In the experiment of determination of equilibrium constant of esterification of ethanol, if , instead of using clean dry bottle, if a bottle already containing slight amounts of ethanoate and water is used to carry out the reaction under identical (remaining) conditions, what would be the consequence?
According to our lecturer it's answer is "The reaction will take lesser time to reach equilibrium". But according to Le Chatelier's principle, increase in concentration of products shifts the reaction backwards. So it should take more time to reach equilibrium. Please help!!