Chemistry Practice Problems Phase Diagram Practice Problems Solution: The high-pressure phase diagram of ice is shown at...

Solution: The high-pressure phase diagram of ice is shown at the top of the next column. Notice that, under high pressure, ice can exist in several different solid forms .What three forms of ice are present at the triple point marked O?

Problem

The high-pressure phase diagram of ice is shown at the top of the next column. Notice that, under high pressure, ice can exist in several different solid forms A diagram of temperature versus pressure. An upward curving line extends from the origin to about .5 atm. From there another upward curving line extends upward, and a straight line extends upward with a negative slope. The region below the two curving lines is labled gaseous water. The region to the right of the vertical line is labled liquid water, and to the left is labled ice one. At the top of the upward line is a trapezoidal shaped region, labled ice three within. To the left of this is a region labled ice two. Above the trapezoid is a region labled ice five. Point O lies at the vertex of the trapezoid and a line extending outward from its upper left hand corner..

What three forms of ice are present at the triple point marked O?

Solution

We’re being asked to determine what three forms of ice present at the triple point marked O. Recall that a phase diagram shows the transition of matter between solid, liquid, and gas phases as temperature and pressure changes.


In a phase diagram:

• Triple Point: the point at which three phases are in equilibrium

• Critical Point: the point at which the liquid and gas phases coexist. The resulting phase is a supercritical fluid.


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