Discussion
Consider the following statements about an enthalpy-concentration diagram.
1. It plots enthalpy against composition at several temperatures.
2. It accounts for the heat of mixing directly.
3. It is needed for every binary mixture.
Answer: C
The first two are correct and are why such diagrams exist for sulphuric acid and for caustic soda. The third overstates it, since most mixtures have negligible heats of mixing and need no such chart. Sulphuric acid and water are the classic exception.
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