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Question: Answered & Verified by Expert
Borax dissolves in water and forms a product of boron (X). Identify the compound $\mathrm{X}$.
Chemistryp Block Elements (Group 13 & 14)AP EAMCETAP EAMCET 2022 (06 Jul Shift 1)
Options:
  • A $\mathrm{HBO}_2$
  • B $\mathrm{B}_2 \mathrm{O}_3$
  • C $\mathrm{NaBO}_2$
  • D $\mathrm{H}_3 \mathrm{BO}_3$
Solution:
1702 Upvotes Verified Answer
The correct answer is: $\mathrm{H}_3 \mathrm{BO}_3$
$\begin{aligned} & \text { Borax }=\mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7 \cdot 10 \mathrm{H}_2 \mathrm{O}=\mathrm{Na}_2\left[\mathrm{~B}_4 \mathrm{O}_5(\mathrm{OH})_4\right] \cdot 8 \mathrm{H}_2 \mathrm{O} \\ & \mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7 \cdot 10 \mathrm{H}_2 \mathrm{O}+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{H}_3 \mathrm{BO}_3\end{aligned}$

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