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  4. Which of the following attacks glass?

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Q. Which of the following attacks glass?

AFMCAFMC 2005The p-Block Elements - Part2

Solution:

Hydrofluoric acid $(HF)$ reacts with glass sodium and calcium silicate and greasy fluorosilicates are formed. It is called etching of glass, so $HF$ is not stored in glass vessels.
$Na _{2} SiO _{3}+6 HF \longrightarrow Na _{2} SiF _{6}+3 H _{2} O$
$Ca _{2} SiO _{3}+6 HF \longrightarrow CaSiF _{6}+3 H _{2} O$