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värvitu hügroskoopne aine, valem H4P2O7, hüdrolüüsub ortofosforhappeks
difosforhape . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/difosforhape/1/est (03.07.2026)
