Miscibility
Under Miscibility is defined as the qualitative statement that, in the mixing of at least two different fluids they completely to form a single homogeneous phase mix .
For example, water and lower alcohols can be mixed in any ratio, but water and benzene form two phases, one rich in water and one rich in benzene. However, the benzene-rich phase also contains water (approx. 0.25 mol percent at 25 ° C) and the water- rich phase contains some benzene (0.04 mol percent at 25 ° C). This means that even this system can be considered miscible to a very limited extent.
The miscibility of some substance mixtures clearly depends on the temperature. An example of this is the mixture of methyl vinyl ketone (3-buten-2-one) and water, which is miscible below 28 ° C and above 84 ° C, but not between these limits ( miscibility gap , see figure).
Their polarity has a major influence on the miscibility of two liquids ; In this way, liquids in particular can be mixed with one another whose polarity matches.
A miscibility table provides information about the miscibility of different liquids.
See also
Web links
- Miscibility table (PDF; 236 kB)