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Question

During an experiment, ice and water were placed in a perfectly insulated thermos flask at 0 °C. Describe this system when it reaches dynamic phase equilibrium. (hint, mention reaction rate and concentration)

Answer 1

An equilibrium reaction means that the reactants are continuously forming into products and products are continuously forming into reactants. In this case, the reaction would be H2O(l) === H2O(s). When equilibrium is reached, the rate of the forward reaction equals the rate of the reverse reaction (the rate at which liquid water is forming into ice is equal to the rate of ice forming into liquid). When the forward and reverse rates are equal, the concentrations remain the same. However, the reaction is still taking place. So, liquid water molecules are still turning into solid and ice molecules are still turning into liquid.