How many phases exist at a triple point? Describe what would...

Name: Problem 65, Chapter 13: Chemistry
Uploaded: 2021-07-05T13:17:15-08:00
Duration: 1 min 55 s
Channel: Adriano Chikande
Description: How many phases exist at a triple point? Describe what would happen if a small amount of heat were added under constant-volume conditions to a sample of water at the triple point. Assume a negligible volume change during fusion.

How many phases exist at a triple point? Describe what would happen if a small amount of heat were added under constant-volume conditions to a sample of water at the triple point. Assume a negligible volume change during fusion.

Key Concepts

Triple Point

The triple point is the unique set of conditions—typically a specific temperature and pressure—where three phases of a substance (solid, liquid, and gas) coexist in equilibrium. It is a fundamental concept in phase diagrams and thermodynamics that represents a fixed point where the phase boundaries of all three phases intersect.

Phase Equilibrium

Phase equilibrium refers to the state in which different phases of a substance exist together without net change in their amounts over time. At equilibrium, the chemical potentials of the phases are equal, ensuring no driving force for transformation in either direction. This concept is critical for understanding how phases coexist and transition under various conditions.

Latent Heat and Phase Transitions

Latent heat is the energy absorbed or released during a phase transition without a change in temperature. At the triple point, adding a small amount of heat can be absorbed as latent heat to drive a phase transition—such as melting of the solid to liquid—while the temperature remains nearly constant until the phase change is complete. This concept explains how energy input results in changes in phase composition rather than a temperature increase.

Constant-Volume Process

A constant-volume process is one in which the volume of the system remains fixed while energy is added or removed. In such processes, any added heat does not perform work through expansion and manifests as changes in the internal energy and phase composition of the system. When a system at the triple point is heated under constant-volume conditions with negligible volume change during phase transitions, the added energy primarily facilitates a phase change rather than raising the temperature.

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