Question
Explain about Bredic’s arc method (or) Electro dispersion method (or) How would you prepare colloids of noble metals?
✓
Answer
1. An electrical arc is struck between electrodes dispersed in water surrounded by ice. When a current of I amp! 100V is passed, an arc produced forms vapours of metal which immediately condense to from colloidal solution.
2. By this method, colloidal solution of many metals like copper, silver, gold. platinum can be prepared.
3. Alkali hydroxide is an added an stabilising agent for the colloid solution.
2. By this method, colloidal solution of many metals like copper, silver, gold. platinum can be prepared.
3. Alkali hydroxide is an added an stabilising agent for the colloid solution.
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