Question

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 (Na₂SiO₃), for example, reacts as follows:

Na₂SiO₃(s) + 8 HF(aq) H₂SiF₆(aq) + 2 NaF(aq) + 3 H₂O(l)

(a) How many moles of HF are needed to react with 0.300 mol of Na₂SiO₃?
(b) How many grams of NaF form when 0.500 mol of HF reacts with excess Na₂SiO₃?
(c) How many grams of Na₂SiO₃ can react with 0.800 g of HF?