What are the ingredients of 10% aqueous formalin?

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Multiple Choice

What are the ingredients of 10% aqueous formalin?

Explanation:
The main idea here is that 10% aqueous formalin is a water-based solution where formaldehyde is the active fixing agent. The 10% refers to the concentration of formaldehyde, which is prepared by diluting a concentrated formaldehyde solution with water. The water portion is essential because it dissolves the formaldehyde to create the fixative. That’s why the ingredients are formaldehyde and water (specifically DI water in many lab protocols). Adding saline would introduce salts that alter osmolarity, and ethanol or glycerol would change the fixation characteristics, so they aren’t part of the standard 10% aqueous formalin.

The main idea here is that 10% aqueous formalin is a water-based solution where formaldehyde is the active fixing agent. The 10% refers to the concentration of formaldehyde, which is prepared by diluting a concentrated formaldehyde solution with water. The water portion is essential because it dissolves the formaldehyde to create the fixative.

That’s why the ingredients are formaldehyde and water (specifically DI water in many lab protocols). Adding saline would introduce salts that alter osmolarity, and ethanol or glycerol would change the fixation characteristics, so they aren’t part of the standard 10% aqueous formalin.

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