Question

What Is The Colour Of Flame Of Sodium And Potassium?

Answer 1

Hint: The visible, gaseous portion of a fire is called a flame. A very exothermic chemical reaction occurring in a narrow zone causes it. Very hot flames have enough ionised gaseous components with enough density to be classified as plasma. The type of fuel used in combustion determines the colour and temperature of a flame.

Complete answer:
Flame colour is influenced by a number of factors, the most important of which are black-body radiation and spectral band emission, with spectral line emission and spectral line absorption having a minor impact. The most significant element affecting colour in the most frequent form of flame, hydrocarbon flames, is oxygen availability and the degree of fuel-oxygen pre-mixing, which influences the pace of combustion and therefore the temperature and reaction pathways, resulting in various colour colours. A flame test is a chemical analytical method that uses each element's unique emission spectrum to identify the presence of specific elements, typically metal ions. Temperature affects the colour of flames in general; see flame colour. The test is exposing a sample of the element or compound to a hot, non-luminous flame and examining the colour of the resulting flame. The test assumes that sample atoms evaporate and, since they are hot, produce light when exposed to flame.
Following are the colour of flames
Lilac; invisible through cobalt blue glass (purple) - Potassium.
Intense yellow; invisible through cobalt blue glass – Sodium

Note:
The flame test is a quick and easy procedure that may be completed using the basic equipment present in most chemical labs. However, because the test depends on the experimenter's subjective feeling rather than quantitative measures, the range of components positively observable under these conditions is limited. The test has trouble detecting tiny concentrations of some elements, while producing an overly strong response for others, causing fainter colours to be missed.