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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