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Let's assume a mixture which can be heated without decomposing. This site explains that while pure substances have a sharply defined melting point and boiling point, mixtures tend to have a melting range. But what about the boiling point of mixtures? Is it always a point, always a range, or sometimes a point and something a range? If it is "sometimes", is one of the cases the rule and the other the exception, or are both pretty common?

To keep the question simple, we can stay with atmospheric pressure.

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    $\begingroup$ If there is a eutectic, then at that composition it is a single melting point. Quite often for some random mix of elements A and B it will be a range. The binary phase diagram will show what you need to know. $\endgroup$ – Jon Custer Dec 1 '17 at 22:32
  • $\begingroup$ Assuming the components are miscible, a mixture has a distinct boiling point, which depends on the precise molar fraction of the solution. Look up vapour-liquid diagram. $\endgroup$ – Gert Dec 1 '17 at 22:53
  • $\begingroup$ See e.g. chemguide.co.uk/physical/phaseeqia/nonideal.html $\endgroup$ – Gert Dec 1 '17 at 23:10
  • $\begingroup$ Mixture is a more general term. Solution can be of liquids or a liquid(s) and solid. Each case is different tough the relevant one is mentioned in the comment by Gert. $\endgroup$ – Alchimista Dec 2 '17 at 9:50

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