Boric acid is a white solid often used as an antiseptic. The formula of boric acid can also be written as $$$\mathrm{B}(\mathrm{OH})_{3}$$$. (i) Draw a dot-and-cross diagram for this molecule. Show outer electrons only. (3) (ii) Suggest a value for the $$$\mathrm{O}-\mathrm{B}-\mathrm{O}$$$ bond angle. Justify your answer. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

Chemistry

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Exam No：wch11-01-que-20240111 Year：2024 Question No：21(b)

Answer:

An answer that makes reference to the following points:
- correct electrons around B
- correct electrons around the oxygens
- correct electrons round the hydrogens
An answer that makes reference to the following points:
- bond angle $120^{\circ}$
- 3 (bonding) pairs of electrons (round B) adopt a position of minimum repulsion

Answer:

Knowledge points:

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Answer:

Knowledge points:

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