Question

can anyone give me the list of common indicators and their colour

Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

$\fbox{Common \: Indicators \: are :-}$

Litmus Paper

Litmus Paper

One common acid and base indicator is litmus paper created by treating filter paper with a dye obtained from lichens. A solution applied to litmus paper will either keep the litmus the same color or change it.

Phenolphthalein Indicator

Phenolphthalein Indicator

The phenolphthalein indicator is a weak acid that has two different structures based on whether it is in an alkali (pink) or acid (colorless) solution. The alkali solution absorbs light in the visible light spectrum, and the human eye perceives a color change to pink at pH level of 8.2, continuing to bright magenta at pH 10 and above.

Bromothymol : Blue Indicator

Bromothymol Blue Indicator

Bromothymol blue, a weak acid, is most commonly used as an indicator for solutions that are relatively neutral —weak acids and bases. Its pH range is between 6 and 7.6. The solution appears yellow up to pH 6, in a neutral solution it is green, and it turns blue in basic solutions above pH 7.6.

Methyl Red Indicator

Methyl Red Indicator

As an acid and base indicator, methyl red turns red in acidic solutions at pH 4.4 and below and turns yellow when pH 6.2 is reached. In between these color endpoints, in the pH range 4.4 to 6.2, the color is orange.

Universal Indicator

Universal Indicator

A universal indicator is a solution that contains a mixture of indicators, often phenolphthalein, methyl red and bromothymol blue. Identification of an approximate pH is obtained by adding several drops of a universal indicator to a solution.