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When caustic soda solution is kept in a ...

When caustic soda solution is kept in a glass bottle, the inner surface of the bottle becomes opaque. Explain.

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Caustic soda (NaOH) being strongly basic reacts with acidic silica `(SiO_2)` present in glass to form sodium silicate `(Na_2SiO_3)`.
`SiO_2 + 2NaOH to Na_2 SiO_3 + H_2O`
As a result, the inner surface of the bottle becomes opaque.
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