Calculate the external pressure that must be applied to seawater, 1.12 M total ion concentration at 10 degrees celsius if the maximum concentration allowed in the product water is 171 mg/L. Assume that all the dissolved salts in the product water is sodium chloride.

The formula to use for this problem is

P = iCRT

where P is the external pressure

i is the van't Hoff factor

C is the concentration in mole/L

R is the gas constant

T is the temperature

Substituting with i = 2 for sodium chloride

P = 2 (171 / (1000*58) (8.314) (10 + 273)

Solve for P to get the pressure in Pascals