1. Hydrofluoric acid, HF (aq), cannot be stored in glass Silicates in the glass

Question

1. Hydrofluoric acid, HF (aq), cannot be stored in glass Silicates in the glass are attacked by the HF (aq). Sodium silicate example, reacts as follows: bottle s because compounds called a. Balance the equation. b. H ow many moles of HF are needed to react with 0.325 mol of Na SiO c. How many grams of NaF form when 0.575 mol of HF reacts with excess Na Sio? d. H ow many grams of Na2SiO, can react with 0.854 g of HF? What is the minimum number of grams of HF that are needed to react with 452 g of Na2SiO? e. (40 points

Explanation / Answer

a. balanced equation :   Na2SiO3(s) + 8HF ---> H2SiF6(aq) + 2NaF + 3H2O(l)

b. 1 mol Na2SiO3 = 8 mol HF

no of mol of HF required = 0.325*8 = 2.6 mol

c. no of mol of NaF formed = 0.575*2/8 = 0.14375 mol

   amount of NaF formed = 0.14375*42 = 6.0375 g

d. no of mol of HF = 0.854/20 = 0.0427 mol

   no of mol of Na2SiO3 required = 0.0427 /8 = 0.0053375 mol

amount of Na2SiO3 required = 0.0053375*122 = 0.6512 g

e. no of mol of Na2SiO3 = 452/122 = 3.705 mol

   no of mol of HF required = 3.705*8/1 = 29.64 mol

   amount of HF required = 29.64*20 = 592.8 g

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