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Physical & Chemical properties

Vapour pressure

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Description of key information

The measured equilibrium vapour pressure of tantalum pentachloride is 69.9 hPa at 169.3 °C. 

Key value for chemical safety assessment

Vapour pressure:
69.9 hPa
at the temperature of:
169.3 °C

Additional information

The equilibrium vapour pressure of TaCl5 was measured by means of a direct method over a temperature range extending below and above the melting point. The measuring apparatus consisted of a Bourdontype fused quartz spiral which was enclosed in a quartz chamber. The TaCl5 vapour from the sample entered only the inside of the spiral while it was possible to equilibrate pressures inside and outside the spiral by admitting air to the outside of the spiral. The pressure could be read directly on a closed-end mercury manometer. Heat was supplied by a resistant furnace. Samples were subjected to repeated heating and cooling cycles.

The measured vapour pressure of TaCl5 was 52.4 mmHg (69.9 hPa) at 169.3 °C.