Problem S2.5. A tiny sack made of membrane permeable to water but not NaCl (sodium chloride) is filled with a 1% solution (by weight) of NaCl and water and is immersed in an open beaker of pure water at 38 C at a depth of 1 ft.

(a) What osmotic pressure is experienced by the sack?

(b) What is the total pressure of the solution in the sack (neglect surface tension)? Assume that the sack is small enough that the pressure of the surrounding water can be assumed constant. (An example of such a sack is a human blood cell.)