Now, if we take the pure water and now we add some type of additional solute molecule, for example, sodium ions, then we decrease the sommotic potential of that non pure water. So now it becomes more negative. So pure water is given a potential of zero. But anytime we take pure water and we add our solute molecules, now we're decreasing the sommotic potential, we're making it more negative. Now, let's suppose we have the following system. So we have a closed container, as shown.