Question

The ground glass stopper is often seen to get stuck in the neck of glass bottles containing aq $NaOH$ solution This is due to:

• A. formation of solid $N{a}_{2}C{O}_3$ around the neck of the bottle due to NaoH reacting with atmospheric $C{O}_2$
• B. formation of solid $N{a}_{2}Si{O}_3$ around the neck of the bottle
• C. creation of partial vacuum due to highly hygroscopic nature of $NaOH$
• D. high coefficient of thermal expansion of glass

Answer 1

The correct option is B formation of solid $N{a}_{2}Si{O}_3$ around the neck of the bottle

The ground glass stopper is often seen to get stuck in the neck of glass bottles containing aq $NaOH$ solution This is due to formation of solid $N{a}_{2}Si{O}_3$ around the neck of the bottle

$2NaOH\left(aq\right)+Si{O}_2\to \underset{fuseswithglass}{N{a}_{2}Si{O}_3\left(s\right)+H_{2}O}$

Hence option $B$ is correct.