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sodium alum

noun
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Definition of sodium alum

: a crystalline double salt NaAl(SO4)2.12H2O used similarly to potassium alum; sodium aluminum sulfate dodecahydrate

— called also soda alum

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“Sodium alum.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/sodium%20alum. Accessed 10 December 2019.

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