Question
How is borax obtained from its mineral colemanite?
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Answer
Borax is obtained from its mineral colemanite by boiling it with a solution of sodium carbonate.
$\underset{\text { Colemanite }}{ Ca _2 B _6 O _{11}}+\underset{\substack{\text { Sodium } \\ \text { carbonate }}}{2 Na _2 CO _3} \xrightarrow[\text { }]{\Delta} \underset{\text { Borax }}{ Na _2 B _4 O _7}+\underset{\text { Sodium metaborate}}{2 NaBO _2}+\underset{\text { Carconate }}{2 CaCO _3 \downarrow}$
$\underset{\text { Colemanite }}{ Ca _2 B _6 O _{11}}+\underset{\substack{\text { Sodium } \\ \text { carbonate }}}{2 Na _2 CO _3} \xrightarrow[\text { }]{\Delta} \underset{\text { Borax }}{ Na _2 B _4 O _7}+\underset{\text { Sodium metaborate}}{2 NaBO _2}+\underset{\text { Carconate }}{2 CaCO _3 \downarrow}$
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