(1) Hydrofluoric acid, HF(aq), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the HF(aq). For example, sodium silicate, Na2SiO3, reacts in the following way Na2SiO3(s) + 8 HF(aq) → H2SiF6 (aq) + 2 NaF(aq) + 3 H2O(l) Atomic weights (g/mol): Na=23, Si=28, O=16, H=1, F=19 (a) Balance the above chemical equation that represents the reaction. (b) How many moles of sodium silicate can be attacked by 9.0 moles of hydrofluoric acid?
(1) Hydrofluoric acid, HF(aq), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the HF(aq). For example, sodium silicate, Na2SiO3, reacts in the following way
Na2SiO3(s) + 8 HF(aq) → H2SiF6 (aq) + 2 NaF(aq) + 3 H2O(l)
Atomic weights (g/mol): Na=23, Si=28, O=16, H=1, F=19
(a) Balance the above chemical equation that represents the reaction.
(b) How many moles of sodium silicate can be attacked by 9.0 moles of hydrofluoric acid?
(c) How much each (in grams) of NaF(aq) and water will be produced from 9.0 moles of hydrofluoric acid?
(d) If 200 grams of HF(aq) attacked 1.5 moles sodium silicate , identify the limiting and excess reagents
(e) How much of the excess reagent remains unreacted?
(f) If the reaction in (d) produces 40.0 grams of NaF, calculate the percent yield.
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