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The concentration of potassium chloride in muriate of potash is expressed as a corresponding concentration of potassium oxide (K 2 O), i.e., the concentration of potassium oxide that there would be if the potassium were present as its oxide instead of as its chloride. Thus, muriate of potash that contains (typically) 80% or 97% KCl by weight is said to contain 50% or 60% K 2 O, respectively.
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