Ethylenediaminetetraacetic acid (EDTA) is a tetrabasic acid. If two  H+ are displaced by 2  Na+,EDTA became ethylene diamine tetraacetic disodiuam(EDTA-Na2). The sodium salt of EDTA you mention, i think it maybe is monosoidum salt(EDTA-Na). If you use the EDTA as chelating agent, both are ok, while the ininital pH maybe are different.
Sorry can not input chinese.


【 在 ggXP (hello) 的大作中提到: 】
: 【 以下文字转载自 Chemistry 讨论区 】
: 发信人: ggXP (hello), 信区: Chemistry
: 标  题: EDTA二钠与EDTA钠盐的区别？
: ...................
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