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Question

Borax Bead Test is responded by ________.


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Solution

The borax bead test may be used to distinguish the metaborates of numerous transition metals since they have distinctive colours.

Borax Bead Test:

  1. Borax, Na2B4O7.10H2O, loses water of crystallisation when heated and becomes fused (sodium pyroborate).
  2. It expands into a fluffy, white porous mass that melts into a colourless liquid and then crystallises into a clear, transparent glassy bead made of sodium metaborate and boric anhydride.
  3. Non-volatile describes boric anhydride.
  4. A distinctively coloured metal metaborate bead is created when it reacts with a coloured metallic salt.

Procedure:

  1. When heated, Na2B4O7.10H2O generates a clear, colourless glassy bead in the loop of platinum wire Borax.
  2. A tiny bit of coloured salt applied to this hot bead before it is cooked once again gives it a distinctive colour.
  3. The type of cation present is indicated by the colour of the bead.
  4. Separate notes on the bead's colour are made for oxidising and lowering flames.

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