If 650 mL of a 0.50 M KCl solution are set aside and allowed to evaporate until the volume of the solution is 175 mL, what will the molarity of the solution be?

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

it is stable as it is in group 0 which have full outer shells of electrons