CBSE Class 11-science Answered
Why ionic compounds form colourless flames?
Asked by Pragnya Kar | 30 Jun, 2014, 11:42: PM
Expert Answer
Ionic compounds can form coloured flames.
Solutions of ions, when mixed with concentrated HCl and heated on a nickel/chromium wire in a flame, cause the flame to change to a color characteristic of the atom. Visible colors occur with the following ions:
|
Sodium |
Bright yellow (intense, peristent) |
|
Potassium |
Pale violet (slight, fleeting) |
|
Calcium |
Brick red (medium, fleeting) |
|
Strontium |
Crimson (medium) |
|
Barium |
Light green (slight) |
|
Lead |
Pale bluish (slight, fleeting) |
|
Copper |
Green or blue (medium, persistent) |
A flame test can be used to distinguish between Na+ and K+. Na+ makes a yellow flame while K+ turns the flame a lilac/violet colour. However, flame tests are not required for this standard.
Answered by Hanisha Vyas | 01 Jul, 2014, 11:58: AM
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