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Structure and Solubility of Zinc Borate

The plant that I work at uses a zinc borate (US Borax) compound whose chemical formula is 2ZnO-3H2BO3-3.5H2O ----- essentially a hydrated mixture of zinc oxide, boric acid, and water to form the granular zinc borate.We use it as a wood preservative and must keep it in an insoluble form in our process chemistry.

My question however.....could you take a stab at what the equivalent Lewis or ionic bonding diagram for this compound might be or look like??

I ask because....when we add zinc borate to our predominantly acidic process chemistry (pH 4.0 to 4.1), we see very different solubilities with respect to the zinc and boron fractions of this compound....with the boron being at least 33% to 50% more soluble than Zn.....I'm trying to figure out why and looking at a bonding or Lewis diagram sometimes helps me do that. I just don't know what this one would look like. there any way to empirically determine this compounds electro-negativity or zeta potential??

Many thanks

Solution Summary

Structure and Solubility of Zinc Borate is proposed.