pentabasic
五元鹼性的
pen·ta·ba·sic /ˌpɛntəˈbesɪk/ 形容詞
五元的
Pen·ta·ba·sic a. Chem. Capable of uniting with five molecules of a monacid base; having five acid hydrogen atoms capable of substitution by a basic radical; -- said of certain acids.
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