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If strong bases are present in the glass-stopper bottles, they may react with the glass and etch it or change the concentration of the base. Hence plastic-stopper bottles are used for bases.

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10y ago

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What are the reasons for the use of glass-stoppered bottles for acids and plastic-stoppered bottles for bases?

It is mostly avoidance of glass-glass seals for bases, particularly strong alkalis, that is required. Glass is slowly attacked by strong alkalis and many bases react with atmospehric carbon dioxide - both reactions can lead to the formation of compounds that effectively cement together a glass-glass seal. You get the same reactions within a rubber/plastic-glass seal, but the plasticity of the seal makes the stopper relatively easy to remove.


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