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What is the chemical formula of sodium copper Ethylenediaminetetraacetate in PCB?

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What is the chemical formula of sodium copper Ethylenediaminetetraacetate in PCB?

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Sodium copper ethylenediaminetetraacetate is used as an etchant for electroless copper plating in PCB manufacturing. Its molecular formula is C₁₀H₁₂N₂O₈CuNa₂.2H₂O.

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