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why formalin is used to preserve biological specimens?

The 40% solution of formaldehyde is known as formalin. It is used for the preservation of biological specimens as it is a disinfectant, germicide and antiseptic in nature. It prevents the bacterial growth of the specimens from decaying.

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A solution of 35 to 40 per cent of water in formaldehyde or methanal is called formalin. Formaldehyde's formula is HCHO.

As formalin is a strong disinfectant and tissue hardener, it's used for preserving biological and anatomical specimens. It's also used as an antiseptic in sterilising surgical instruments.

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