Chemistry, asked by Pogo821, 1 year ago

how will you prepare borax from colemanite and boric acid

Answers

Answered by Anonymous
3
Borax contains the tetranuclear unit i.e. [B4O5(OH)4]2– . The correct formula is Na2[B4O5(OH)4].8H2O

2) From Colemanite

The mineral colemanite is finely powdered and is boiled with sodium carbonate solution.

Ca2B6O11 + 2 Na2CO3 ——–> Na2B4O7 + 2 NaBO2 + 2 CaCO3 ↓

The precipitate of calcium carbonate thus formed is removed by filtration. The filtrate is concentrated and cooled when crystals of borax separate out. Sodium metaborate present in the mother liquor can be converted into borax by passing a current of carbon dioxide through it.

3) From boric acid

Borax can also be prepared in small amounts by neutralising boric acid with sodium carbonate.

On cooling crystal of borax i.e. Na2B4O7.10H2O separate out.

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