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Sodium Hydroxide Lye
Sodium hydroxide slowly reacts with glass to form sodium silicate, so glass joints and stopcocks exposed to NaOH have a tendency to "freeze". Flasks and glass-lined chemical reactors are damaged by long exposure to hot sodium hydroxide, and the glass becomes frosted. Sodium hydroxide does not attack iron since Iron does not have amphoteric properties. A few transition metals, however, may react with Sodium Hydroxide in a vigorous way.
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