One Proposed Method of Producing Fresh Water from Sea Water

question 148

Multiple Choice

One proposed method of producing fresh water from sea water is a process called reverse osmosis. In reverse osmosis enough pressure is applied to force water across a membrane from a solution of high solute concentration to one of low concentration. What is the minimum pressure (in atm) needed to have reverse osmosis if sea water may be approximated by a solution with a van't Hoff = 1.83 and a concentration of 0.616 M at 20 ° C?

• A) 14.8 atm
• B) 1.85 atm
• C) 44.0 atm
• D) 1.01 atm
• E) 27.1 atm

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