What does the flame test do?
The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of a bunsen burner. The heat of the flame converts the metal ions into atoms which become excited and emit visible light.
Table of Contents
What is the purpose of using the cobalt glass in the identification of sodium and potassium?
1. The potassium ion (K+) releases two colors of light. Using the cobalt glass allows you to see the “underlying” color by filtering out the dominant color as the potassium burns.
What color does cobalt burn?
Silver-white
Common elements
| Symbol | Name | Color |
|---|---|---|
| Ce | Cerium | Yellow |
| Co | Cobalt | Silver-white |
| Cr | Chromium | Silver-white |
| Cs | Caesium | Blue-violet |
What is the purpose of using cobalt glass in the identification?
Using the cobalt glass allows you to see the “underlying” color by filtering out the dominant color as the potassium burns. Identify which color the cobalt glass filters out – this color is also potassium’s dominant color.
Why does cobalt glass help flame tests?
Aside from an appealing appearance, cobalt glass can be used as an optical filter for flame tests, because it filters out the contaminating colors cast from iron and sodium.
Why is cobalt glass blue?
Cobalt blue glass is normally a deep rich blue like the vase on the left. It is made by incorporating cobalt oxide in the molten glass mixture. Most blue glass is given its color either from cobalt oxide or from copper oxide added to the molten glass. Copper is a more delicate colorant than cobalt.
What was France’s excuse for invading Mexico?
1861-1867. The Second French intervention in Mexico began in December 1861, when Emperor Napoleon III invaded Mexico on the pretext that Mexico had refused to pay its foreign debt, though, in reality, the Emperor wanted to take advantage of the American Civil War to expand his empire in Latin-America.
What is the significance of the La Raspa song?
The minimalist movements of this dance are often taught to school children. Not only does it promote physical education, but, as the Ballet Folklorico Mexico notes, another purpose of doing so “is to encourage children to carry on the dances and traditions of Mexico and other cultures.”
Why is cobalt blue glass used in flame test?
Answer Wiki. Cobalt blue glass is usually used as an optical filter in flame tests. In flame tests sodium ions may contaminate a sample producing a yellow colour flame which might mask the colour of other ions you need to determine. Blue glass absorbs these sodium ions hence other colours can be seen.
What is the color of sodium in flame test?
In flame tests, sodium ions may contaminate a sample and produce a yellow flame, masking the colors of the other ions. Using blue cobalt glass will absorb the yellow color and the other substances in the flame can be seen. Barium Nitrate yellow; 6 sec
Why is the test flame bluish green in color?
The characteristic bluish-green color of the flame is due to the copper. The test flame is often viewed through cobalt blue glass to filter out the yellow of sodium and allow for easier viewing of other metal ions.
What is a flame test?
Gas flame. A flame test is an analytic procedure used in chemistry to detect the presence of certain elements, primarily metal ions, based on each element’s characteristic emission spectrum.
