Indicators change their colour when dipped …

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Indicators change their colour when dipped in acid or base. Thus this involves a chemical reaction since there's a change in colour. Explain the reaction.

Posted by Sajal Samveg 5 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 4 years, 11 months ago

Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution. When copper reacts with the elements (oxygen, water and carbon dioxide), it turns from its element color of reddish-brown to green. This chemical reaction is hydrated copper carbonate, and a famous example of it is the Statue of Liberty.

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