(C) The chemical formula of borax is $Na_2 B_4 O_7 \cdot 10 H_2 O$, which is more accurately represented as $Na_2 [B_4 O_5 (OH)_4] \cdot 8 H_2 O$. $Na

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(C) The chemical formula of borax is $Na_2 B_4 O_7 \cdot 10 H_2 O$, which is more accurately represented as $Na_2 [B_4 O_5 (OH)_4] \cdot 8 H_2 O$. $Na_2 B_4 O_7 \cdot 5 H_2 O$ is known as tincalconite (borax pentahydrate). $Na_2 B_4 O_7 \cdot 7 H_2 O$ and $Na_2 B_4 O_7 \cdot 2 H_2 O$ are not standard common forms of borax.