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happe molekulis sisalduvate happeliste vesinikuaatomite (loovutatavate prootonite) arv
happe prootonilisus . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/happe%20prootonilisus/1/est (10.07.2026)
