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Question
Using a platinum wire, cone, hydrochloric acid and a Bunsen burner how would you distinguish between the three salts e. sodium chloride, potassium chloride and calcium chloride. Explain in brief the method used for the same.
Solution
Application of flame test – to identify the metal in the substance.
| Method | Colour imparted to the flame | Colour-through blue glass | Metallic radical |
|
Thin platinum wire is throughly cleaned and of a burner. |
Golden yellow | Pale yellow | Sodium[Na1+] |
| When the wire imparts no colour it is dipped in conc. HCl and then - | Lilac | Violet | Potassium [K1+] |
| The wire is then reintroduced into the - non-luminous flame and the-colour imparted is noted. |
Brick red | Pale grren | Calcium [Ca2+] |
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