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Question

Sodium chloride has a van’t Hoff factor of 2.00. What is the osmotic pressure of a 2.60 M NaCl solution at 25.00°C?

Answer 1

Osmotic pressure (π) = iMRT

i = van't Hoff factor = 2.00

M = 2.60 M

R = gas constant = 0.0821 Latm/Kmol

T = temperature in K = 25.00 + 273.15 = 298.15K

Solving for π, we have...

π = (2.00)(2.60)(0.0821)(298.15)

π = 127 atm