A chemist have to fill a 500 mL beaker with saturated solution of sodium nitrate and water at room temperature. How could the chemist increase the concentration of sodium nitrate in the solution
A) pour out some of the solution from the beaker, then add pure water
B) add more sodium nitrate to the beaker and raise the temperature
C) pour out some of the solution from the beaker
D) add more sodium nitrate to the beaker and decrease the temperature