La presión osmótica medida de una disolución acuosa 0.010 M de CaCl2 es de 0.674 atm a 25^∘ C.

step 1 Problem 83. Osmotic pressure pi calculated equals to MRD. Now put the values. Osmotic pressure p

La presión osmótica medida de una disolución acuosa 0.010 M...

La presión osmótica medida de una disolución acuosa $0.010 \mathrm{M}$ de $\mathrm{CaCl}_2$ es de $0.674 \mathrm{~atm}$ a $25^{\circ} \mathrm{C}$. (a) Calcule el factor de van't Hoff, $i$, de la disolución. (b) ¿Cómo cabe esperar que cambie el valor de $i$ al aumentar la concentraciốn de la disolución? Explique

Key Concepts

Dissociation Equilibrium

Dissociation equilibrium pertains to the process whereby an ionic compound separates into ions in solution. The degree of dissociation affects the effective concentration of particles, thereby influencing colligative properties such as osmotic pressure. Understanding the equilibrium between associated and dissociated species helps in determining the correct van't Hoff factor for a solution.

Van't Hoff Factor

The van't Hoff factor (i) is a dimensionless quantity that indicates how many discrete particles a solute produces in solution compared to its formula units. It explains how solute dissociation influences colligative properties, where full dissociation leads to an i value equal to the total number of ions produced, while real solutions may exhibit deviations due to ion pairing or incomplete dissociation.

Osmotic Pressure

Osmotic pressure is a colligative property representing the pressure required to prevent the net flow of solvent through a semipermeable membrane into a solution. It is directly dependent on the number of solute particles in solution, temperature, and the concentration, and is typically calculated using the equation ? = iMRT where the van't Hoff factor adjusts for solute dissociation.

Colligative Properties

Colligative properties are characteristics of solutions that depend solely on the number of solute particles present rather than their specific identity. These properties include osmotic pressure, boiling point elevation, freezing point depression, and vapor pressure lowering, making them useful for studying solute behavior like dissociation and association in solutions.

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