The correct formula of borax is:....

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The correct formula of borax is:
\( \mathrm{P} \)
(1) \( \mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O} \)
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(2) \( \mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 4 \mathrm{H}_{2} \mathrm{O} \)
(3) \( \mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 8 \mathrm{H}_{2} \mathrm{O} \)
(4) \( \mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 10 \mathrm{H}_{2} \mathrm{O} \)


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