OneTime: Test: Gibbs Phase Rule - Chemistry MCQ

Since at the triple point, the degree of freedom is zero (that is invariant reaction takes place at that point), therefore according to phase rule, F = C - P + 2. Substituting the known values, we get P = 3 (all states).

In a phase region above the eutectic point, both the solid and liquid phases exist together where the region is bi variant and this region is called isometric region. Here the region has 2 degrees of freedom.

A homogeneous mixture is one which is miscible completely with one another. In any saturated solution, when the amount of solute reaches more than a critical point, then the solution becomes heterogeneous.

In a condensed phase rule system, the phases are represented in three dimension which is not suitable for graphic purposes and hence the pressure is considered to be zero (this is helpful in drawing 2D images). Hence the formula reduces to F = C - P + 2.

According to equilibrium mixture ration, an appropriate ratio of 1:10 parts of solid and liquid along with an aqueous solution will give a stable phase product.

The above phase rule is a formula that gives the condition for finding the number of phases in a system. This phase rule can be applied to both condensed as well as normal systems.

Since at the triple point, the degree of freedom is zero, while applying the formula F = C - P + 2, we get the number of phases as three because C = 1, F = 0 (since water system forms only single component).

A phase diagram gives information only on the concentration of species, their solubility rate, degree of freedom and other physical properties. It does not explain about transformation rates and relative concentration (relative concentration=total concentration/equilibrium concentration).

A terminal solution, an intermediate solution, an equilibrium solution and concentric solutions, are the ones which take part in a phase reaction. On the other hand, a saturated solution is involved in the Lever system.

According to Weiss law (which suits only for phase components), concentration at equilibrium is C = T/P. therefore in this case, C = 1/1 = 1. This law is also called as Gibbs relativity law.