Hydrofluoric acid, HF(aq), cannot be stored in glass bottles
because compounds called silicates in the glass are attacked
by the HF(aq). Sodium silicate 1Na2SiO32, for example, reacts
Na2SiO31s2 + 8 HF1aq2¡ H2SiF61aq2 + 2 NaF1aq2 + 3 H2O1l2
(b) How many grams of NaF form when 0.500 mol of HF
reacts with excess Na2SiO3?
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