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Vapour pressure of water below 100°C - Molar heat of vaporization
Principle: The vapour pressure of water in the range of 40°C to 85°C is investigated. It is shown that the Clausius-Clapeyron equation describes the relation between temperature and pressure in an adequate manner. An average value for the heat of vaporization of water is determined.
Tasks:
1. About 250 ml of de-mineralized water are allowed to boil for about 10 minutes to eliminate all traces of dissolved gas. The water is then cooled down to room temperature.
2. The 3-neck round flask is filled about three-quarters full with gas-free water and heated. At 35°C the space above the water within the round flask is evacuated. Further heating causes an increase in pressure p and temperature t of water within the round flask. p and t are read in steps of 5°C up to a maximum of t = 85°C.
| Artikel-Nr. | Artikelbezeichnung |
|---|---|
| P2340200 | Vapour pressure of water below 100°C – Molar heat of vaporization |
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