To test Schiff reagent reliability, which chemical is added to a small aliquot?

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Multiple Choice

To test Schiff reagent reliability, which chemical is added to a small aliquot?

Explanation:
Schiff reagent gives its magenta color only when aldehyde groups are present to react with. To confirm the reagent is still active, you add a known aldehyde to a tiny sample of Schiff reagent. Formaldehyde is the simplest aldehyde and will reliably produce the characteristic color if the Schiff reagent is intact. The other options aren’t aldehydes (acetic acid is an acid, sodium hydroxide is a base, ethanol is an alcohol) and thus won’t trigger the Schiff reaction. If formaldehyde fails to induce color, the Schiff reagent has degraded or lost potency and should be discarded before use in staining.

Schiff reagent gives its magenta color only when aldehyde groups are present to react with. To confirm the reagent is still active, you add a known aldehyde to a tiny sample of Schiff reagent. Formaldehyde is the simplest aldehyde and will reliably produce the characteristic color if the Schiff reagent is intact. The other options aren’t aldehydes (acetic acid is an acid, sodium hydroxide is a base, ethanol is an alcohol) and thus won’t trigger the Schiff reaction. If formaldehyde fails to induce color, the Schiff reagent has degraded or lost potency and should be discarded before use in staining.

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