An unknown compound (x) melts at 60°C and is mixed with a compound (y) that melts at 45°C and is soluble in x. Will the Melting point for the mixture start below 45°?
I think so, because if you look at ice and salt for an example, salt has a way higher melting point than water does, but it lowers the melting point of water anyway. This is the opposite of the question though. Y is soluble in X and has a lower melting point, but salt has a higher melting point and is soluble in water. I don't know if this is a good way to think about the question.
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The melting point of a mixture is lower than the melting point of either pure compound.
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