Which is not true about borax?

In borax $\left({\mathrm{Na}}_2{\mathrm{B}}_4{\mathrm{O}}_7\cdot 10{\mathrm{H}}_2\mathrm{O}\right),$ among 10 water molecules 2 molecules are part of structure, ie., exists ${\mathrm{Na}}_2\left[{\mathrm{B}}_4{\mathrm{O}}_5(\mathrm{OH}{)}_4\right]\cdot 8{\mathrm{H}}_2\mathrm{O}$

${\mathrm{Na}}_2\left[{\mathrm{B}}_4{\mathrm{O}}_5(\mathrm{OH}{)}_4\right]\cdot 8{\mathrm{H}}_2\mathrm{O}+2\mathrm{HCl}⟶2\mathrm{NaCl}+4{\mathrm{H}}_3{\mathrm{BO}}_3+5{\mathrm{H}}_2\mathrm{O}$
Methyl orange (pH =3.7) is used to detect end point. Aq. solution of borax acts as buffer, as borax is salt of strong base NaOH and weak acid H₃BO₃.