whal is litmus paper?
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Litmus paper is filter paper which has been treated with a natural water-soluble dye obtained from lichens. The resulting piece of paper, called "litmus paper", can be used as a pH indicator. ... Neutral litmus paper turns red under acidic conditions and blue under alkaline conditions.
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Litmus paper is a indicator. Litmus paper is used to verify whether a substance is a base or an acid.
It turns blue when in contact with a base.
And red when in contact with acid
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