How can borax be obtained from sodium metaborate ?...I Think No One can Answeer This Question :(
Answers
Explanation:
Borax occurs naturally in evaporated deposits produced by the repeated evaporation of seasonal lakes. ... Borax can also be produced synthetically from other boron compounds. Naturally occurring borax is refined by process of re-crystallization. Borax, sodium tetraborate decahydrate, is not acutely toxic.
Sodium metaborate is prepared by the fusion of sodium carbonate and boron oxide B
2O
3[1] or borax Na
2B
4O
7. Another way to create the compound is by the fusion of borax with sodium hydroxide at 700° C:
B
2O
3 + 2 NaOH → 2 NaBO
2 + 2 H
2O
The boiling point of sodium metaborate (1434 °C) is lower than that of boron oxide (1860 °C) and borax (1575 °C) In fact, while the metaborate boils without change of composition, borax gives off a vapor of sodium metaborate with a small excess of sodium oxide Na
2O.[2]