Table of Contents
How does cobalt blue glass help flame tests?
Cobalt glass plates are used as an optical filter in flame tests to filter out the undesired strong yellow light emitted by traces of sodium, and expand the ability to see violet and blue hues, similar to didymium glass.
What color is cobalt in a flame test?
Common elements
| Symbol | Name | Color |
|---|---|---|
| Co | Cobalt | Silver-white |
| Cr | Chromium | Silver-white |
| Cs | Caesium | Blue-violet |
| Cu(I) | Copper(I) | Bluish-green |
Why is cobalt glass used when testing for potassium and sodium?
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. Identify which color the cobalt glass filters out – this color is also potassium’s dominant color.
Why does cobalt glass alter the color of a flame?
Cobalt glass turns blue very easily without too much work put into it. It’s used in flame tests to filter out the yellow flame caused by the presence of 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.
How do you identify cobalt blue glass?
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.
How are the colors in the flame test produced?
When the atoms of a gas or vapor are excited, for instance by heating or by applying an electrical field, their electrons are able to move from their ground state to higher energy levels. This energy corresponds to particular wavelengths of light, and so produces particular colors of light.
Who makes cobalt glass?
The Hazel Atlas Glass Company
The Hazel Atlas Glass Company created cobalt blue glass in the Depression era. One of the company’s most famous creations was the Shirley Temple mug and tableware collection, which had a decal of the child actress on it.
What does cobalt blue symbolize?
Meanings and History of Cobalt Blue Cobalt blue color is soothing and peaceful. It can suggest richness. Like azure and other medium blues, its qualities include stability and calmness.
Why do we see colors in the flame tests and why are there different colors for different metal ions?
When you heat an atom, some of its electrons are “excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. The different mix of energy differences for each atom produces different colours. Each metal gives a characteristic flame emission spectrum.
How does the flame test work?
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.