1.6690 g of chemically pure crystallized sodium tetraborate were dissolved in a 200 cm3 volumetric flask. For titration of 20 cm3 of the resulting solution, 17.5 cm3 of an H2SO4 solution with a titer of TH2SO4 / KOH = 0.002806 g/cm3 is consumed. Prove that sodium tetraborate crystallizes with 10 water molecules.

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