Question

What is universal Indicator? For which
What will be
its Colour in solution / of sodium Chloride
what conclusion will you draw onthe basis of these
of these​

Answer 1

Answer:

A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. Although there are several commercially available universal pH indicators, most are a variation of a formula patented by Yamada in 1933. Details of this patent can be found in Chemical Abstracts. Experiments with Yamada's universal indicator are also described in the Journal of Chemical Education.

A universal indicator is typically composed of water, propan-1-ol, phenolphthalein sodium salt, sodium hydroxide, methyl red, bromothymol blue monosodium salt, and thymol blue monosodium salt.[4] The colours that indicate the pH of a solution, after adding a universal indicator, are

pH range Description Colour

< 3 Strong acid Red

3–6 Weak acid Orange or yellow

7 Neutral Green

8–11 Weak alkali Blue

> 11 Strong alkali purple yes

The colours from yellow to red indicate an acidic solution, colours blue to violet indicate alkali and green colour indicates that a solution is neutral.

Universal indicator components

Indicator Low pH colour Transition pH range High pH colour

Thymol blue (first transition) Red 1.2 – 2.8 Yellow

Methyl orange Red 3.2 – 4.4 Yellow

Methyl red Red 4.8 – 6.0 Yellow

Bromothymol blue Yellow 6.0 – 7.6 Blue

Thymol blue (second transition) Yellow 8.0 – 9.6 Blue

Phenolphthalein Colourless 8.3 – 10.0 Fuchsia

Wide-range pH test papers with distinct colours for each pH from 1 to 14 are also available. Colour matching charts are supplied with the specific test strips purchased.

Explanation:

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