hydrofluoric acid

[logistic_guy]

Hydrofluoric acid, \(\displaystyle HF(aq)\), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the \(\displaystyle HF(aq)\).
Sodium silicate \(\displaystyle (Na_2SiO_3)\), for example, reacts as follows:

\(\displaystyle Na_2SiO_3(s) + 8HF(aq) \rightarrow H_2SiF_6(aq) + 2NaF(aq) + 3H_2O(l)\)

(a) How many moles of \(\displaystyle HF\) are needed to react with \(\displaystyle 0.300\) mol of \(\displaystyle Na_2SiO_3\)?
(b) How many grams of \(\displaystyle NaF\) form when \(\displaystyle 0.500\) mol of \(\displaystyle HF\) reacts with excess \(\displaystyle Na_2SiO_3\)?
(c) How many grams of \(\displaystyle Na_2SiO_3\) can react with \(\displaystyle 0.800\) g of \(\displaystyle HF\)?

 

[khansaheb]

Hydrofluoric acid, \(\displaystyle HF(aq)\), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the \(\displaystyle HF(aq)\).
Sodium silicate \(\displaystyle (Na_2SiO_3)\), for example, reacts as follows:

\(\displaystyle Na_2SiO_3(s) + 8HF(aq) \rightarrow H_2SiF_6(aq) + 2NaF(aq) + 3H_2O(l)\)

(a) How many moles of \(\displaystyle HF\) are needed to react with \(\displaystyle 0.300\) mol of \(\displaystyle Na_2SiO_3\)?
(b) How many grams of \(\displaystyle NaF\) form when \(\displaystyle 0.500\) mol of \(\displaystyle HF\) reacts with excess \(\displaystyle Na_2SiO_3\)?
(c) How many grams of \(\displaystyle Na_2SiO_3\) can react with \(\displaystyle 0.800\) g of \(\displaystyle HF\)?

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