Which is not true about borax ?

Step-by-step solution

In borax Na 2 B 4 O 7 · 1 0 H 2 O , among 10 water molecules 2 molecules are part of structure, i.e., exists Na 2 B 4 O 5 OH 4 · 8 H 2 O Na 2 B 4 O 5 OH 4 · 8 H 2 O + 2 HCl → 2 NaCl + 4 H 3 BO 3 + 5 H 2 O At end point pH is about 4 and, therefore, Methyl orange (works between pH = 3.1 - 4.4) is used to detect end point. Aq. solution of borax acts as buffer, as borax is salt of strong base NaOH and weak acid H 3 BO 3 . B 4 O 5 ( O H ) 4 2 − ( s ) + 5 H 2 O ( l ) ⇌ 2 B ( O H ) 3 ( a q ) ( w e a k a c i d ) + 2 [ B (