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Natural indicators are substances found in nature that change color
when they come into contact with acids or bases, helping us identify the pH of
a solution without using synthetic chemicals.
·
Red cabbage juice: Changes color from reddish-purple in acidic solutions to
greenish-yellow in basic solutions.
·
Turmeric: Turns yellow in acidic and neutral solutions but changes to
reddish-brown in alkaline conditions.
·
Beetroot juice: Changes color depending on the pH but is less commonly used.
·
Litmus (from lichens): The original source of litmus paper; turns red in acid and blue
in base.
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