Question

Define vont hoff equation for dilute solution

Answer 1

Explanation:

The van't Hoff theory describes that substances in dilute solution obey the ideal gas laws, resulting to the osmotic pressure formula π = (n/V)RT = [Ci]RT where R is the gas constant, T the absolute temperature, and [Ci] the molar concentration of solute i in dilute solution (1).

Answer 2

Vont Hoff equation for dilute solution

Explanation:

• Consider a dilute solution of a volume V (in $dm^3$ ) containing W grams of a substance having molecular weight M at an absolute temperature T. Then, concentration of the solution, C=n/V and No. of moles of the substance, n=W/M.
• By van't Hoff. Boyle's law, at a constant temperature, the osmotic pressure of a solution is directly proportional to its molar concentration or inversely proportional to the volume of the solution. Thus,  

                            παC(when temperature is constant)

• Van't Hoff Charle's law at the constant concentration the osmotic pressure of a dilute solution is directly proportional to the absolute temperature(T) i.e.

                          παT

                          παCT

                          v=CRT.

• The equation is called van't Hoff general solution equation.

• R is constant of proportionality, also called general solution constant or gas constant.

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