An aqueous solution of NaOH contains 20% NaOH by mass. It is desired to produce a 12% NaOH solution by diluting the concentrated solution stream with a stream of pure water. Find the amount of pure water that is added and the total solution that will be obtained. R= 180 kg/h and 120 kg/h 4. In a steady-state desalination process, seawater, with a mass fraction of salt of 0.035, is evaporated to produce 1000 kg/h of pure water.

 Determine the flow rate of seawater at the inlet, if due to corrosion considerations the discarded saline solution has a mass fraction of salt of 0.07 R = 2000 kg/h and 1000 kg/h