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What is the osmotic pressure of seawater at 298 K, given the concentrations of the major...

What is the osmotic pressure of seawater at 298 K, given the concentrations of the major components: Cl (0.536 mol L-1) and Na (0.457 mol L-1). Assume that at low enough concentrations, that the solute effect on osmotic pressure is additive.

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Answer #1

Ans. Osmotic pressure, (pi) = M R T

            Where, M = molar concentration of a solute

                        R = Universal gas constant = 0.0821 atm.L/mol.K

                        T = temperature in kelvin

Pi due to Cl, (pi 1) = 0.536 mol L-1 x (0.0821 atm.L/mol.K) x 298 K          

                        = 13.1136688 atm

Pi due to Na, (p1 2) = 0.457 mol L-1 x (0.0821 atm.L/mol.K) x 298 K        

                        = 11.1808706 atm

Total osmotic pressure (sum of Pi 1 and Pi 2) = 13.1136688 atm + 11.1808706 atm

                                                            = 24.2945394 atm

                                                            = 24.3 atm

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