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I took the solid Na12P2W18O62 that I place in the oven yesterday and pulled vacuum on it (using our lyophilizer -- pressure = 0.02 Torr). I left the sample under vacuum for 6 hours. After this time I collected and massed the remaining solid.
Container Mass = 87.7106g
Container + Solid = 139.7001g
Mass of Na12P2W18O62 = 51.989g
The referenced paper, see here claims a 70g yield. We may approach that with the second recrystallization that is ongoing at 4C. I will isolate this material next week.