Question
Often a ground glass stopper gets stuck in the neck of a glass bottle containing $$NaOH$$ solution. This is due to :
A.
The presence of dirt particles in between.
B.
The formation of solid silicate in between by the reaction of $$Si{O_2}$$ of glass with $$NaOH.$$
C.
The formation of $$N{a_2}C{O_3}$$ in between by the reaction of $$C{O_2}$$ of air and $$NaOH.$$
D.
Glass contains a boron compound which forms a precipitate with the $$NaOH$$ solution.
Answer :
The formation of solid silicate in between by the reaction of $$Si{O_2}$$ of glass with $$NaOH.$$
Solution :
\[Si{{O}_{2}}+2NaOH\to \underset{\begin{smallmatrix}
\text{Sodium} \\
\text{silicate}
\end{smallmatrix}}{\mathop{N{{a}_{2}}Si{{O}_{3}}}}\,+{{H}_{2}}O\]