Calculate the external pressure that must be applied to seawater 1.14 M total ion concentration

The external pressure that is being in this problem is the osmotic pressure produced by the seawater.

The formula for the osmotic pressure is

P = CRT

where

P is the osmotic pressure in atm

C is the concentration in moles/L or M

R is the universal gas constant = 0.0821 atm-L / mol-K

T is the temperature of the solution (assume 25 C = 298 K)

P = 1.14 (0.0821) (298)

P = 27.89 atm