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From the Wikipedia article for hexafluorosilicic acid:

Melting point:

ca. 19 °C (66 °F; 292 K) (60–70% solution)

$<$ −30 °C (−22 °F; 243 K) (35% solution)

What's the reason for this huge difference in melting point while the solution concentration differs by about 30%?

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    $\begingroup$ if you compare it to e.g. the phase diagram of water - sulfuric acid, it is not a huge difference at all. $\endgroup$
    – Poutnik
    Commented Aug 17, 2023 at 11:26
  • $\begingroup$ Yeah, it's nothing special. One could say something like (H3O)2SiF6 is essentially a compound that melts, not a solid solution. $\endgroup$
    – Mithoron
    Commented Aug 17, 2023 at 14:21

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