Figure 5.11. NaI-RbI Phase Diagram for Questions. Phase relations of NaI-RbI mixtures as a function of temperature in °C. Click on the diagram if you wish to see the interactive version that show coordinates on mouseover.
Answers to the following questions can be determined using the NaI-RbI Phase Diagram shown here or on an interactive version (Figure 5.10) visible by clicking on the diagram.
Yes. If you mix 40 moles of NaI and 60 moles of RbI together and heat the mixture to 550°C, the equilibrium assemblage will be all liquid. No. If you mix 40 moles of NaI and 60 moles of RbI together and heat the mixture to 550°C, the equilibrium assemblage will be all liquid. See the black dot on the diagram above.
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Yes. The solid will be approximately 92% RbI (8% NaI).
No. The solid will be approximately 92% RbI (8% NaI). If you click on the diagram to open the interactive version, you can use the "Coordinates" button to find the composition of the RbI solidus at 550°C. See the bulk composition, the liquid composition, and the RbI phase composition on the diagram above.
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Yes. The pure NaI and RbI crystals will react to form solid solution crystals with equilibrium compositions on either side of the NaI-RbI solvus. The NaI crystals will have the composition 14 mole % RbI (86 mole % NaI). (NaI)86(RbI)14.
No. Use the "Coordinates" button on Figure 5.10 to find the composition of the NaI on the NaI-RbI solvus at 450°C and try again.
Yes. The pure NaI and RbI crystals will react to form solid solution crystals with equilibrium compositions on either side of the NaI-RbI solvus. The NaI crystals will have the composition 14 mole % RbI (86 mole % NaI). (NaI)86(RbI)14.
No. The pure NaI and RbI crystals will react to form solid solution crystals with equilibrium compositions on either side of the NaI-RbI solvus. The NaI crystals will have the composition 14 mole % RbI (86 mole % NaI). (NaI)86(RbI)14. See the bulk composition and the composition of the NaI-rich crystals and the composition of the RbI-rich crystals on the diagram above.
