In the structure of borax,the numbers of boro | vedclass

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(A) The chemical formula of borax is $Na_2[B_4O_5(OH)_4] \cdot 8H_2O$. The anionic part of borax is the tetranuclear unit $[B_4O_5(OH)_4]^{2-}$. In th

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$4$ and $5$

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(A) The chemical formula of borax is $Na_2[B_4O_5(OH)_4] \cdot 8H_2O$. The anionic part of borax is the tetranuclear unit $[B_4O_5(OH)_4]^{2-}$. In this structure,there are $4$ boron atoms. Looking at the structure,there are $5$ oxygen atoms bridging the boron atoms,forming $5$ $B-O-B$ linkages. Therefore,the number of boron atoms is $4$ and the number of $B-O-B$ units is $5$.

In the structure of borax,the numbers of boron atoms and $B-O-B$ units,respectively,are

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