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potassium sulfate

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noun Chemistry.
a crystalline, water-soluble solid, K2SO4, used chiefly in the manufacture of fertilizers, alums, and mineral water, and as a reagent in analytical chemistry.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Origin of potassium sulfate

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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