Physical properties of hydrogen iodide

Physical properties of Hydrogen iodide (HI) -

1- It is a colourless gas having pungent odour.

2- It is heavier than air and fumes strongly in moist air.

3- It condenses to a colourless liquid at 0°C and 4 atmospheric pressure.

4- It is highly soluble in water.

5- It boils at - 35.5°C and freezes to a white solid which melts at - 50.8°C.

6- It forms a constant boiling mixture at 127°C when the solution contains 57% of HI.