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[求助] Na2EDTA ph=7 制备方法

ZnO/In2S3 core/shell nanowires arrays were prepared via an electrodeposition process by using the above ZnO nanowires arrays as working electrode in an aqueous solution of 1 mM InCl3 and 2 mM Na2S2O3 as indium and sulfur sources, respectively, dissolved in 0.1 M KCl as supporting electrolyte. In addition, 2 mM Na2EDTA was added as a chelating agent with pH value of 7 in order to control the reaction rate and decrease the formation of metal complexes such as In(OH)3

上述文字是我在一篇文献中看到的制备方法,现在有几点疑惑向大家请教,希望大家不吝赐教,多多讨论。
本人主要是对In addition 那句话不怎么理解,比如我在配置上述电解质溶液时,是先把 InCl3 Na2S2O3  KCl 称量好置于250ml容量瓶中,然后另配2 mM Na2EDTA 向前面的溶液中滴定至ph=7吗?  还是直接向250ml容量瓶中加入2 mM Na2EDTA (其本身ph=7),即四中物质一起称量置于容量瓶中定容(配好后的溶液的ph不等于7?)
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