Assertion: potassium nitrate | /r/CapableOf | spell saltpeter
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text: Saltpetre , also spelled Saltpeter, also called Nitre , or Niter , any of three naturally occurring nitrates, distinguished as (1) ordinary saltpetre, or potassium nitrate, KNO 3 ; (2) Chile saltpetre , cubic nitre, or sodium nitrate, NaNO 3 ; and (3) lime saltpetre, wall saltpetre, or calcium nitrate , Ca(NO 3 ) 2 .