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Tollen Reagent for Aldehyde and Ketone
Price :
৳1400
Size :
- 100 ml
Estimated Shipping Time: Deliveries take up to 2-3 days after you place your order.
Uses: Lab Essentials
Product SKU: pBF7840AVS
Tollen Reagent for Aldehyde and Ketone
Tollen reagent is a solution
containing silver nitrate (AgNO₃) in ammonia (NH₃), which is used to test for
aldehydes. When an aldehyde is present, it reduces the silver ion (Ag⁺) to
metallic silver, forming a silver mirror on the test tube. Ketones, however, do
not react with Tollens’ reagent, making this a selective test for aldehydes.
Composition of Tollens’ Reagent
Tollens’ reagent is prepared by adding
ammonia (NH₃) to a dilute solution of silver nitrate (AgNO₃). The reaction
between ammonia and silver nitrate results in the formation of a colorless
complex ion, [Ag(NH₃)₂]⁺, which is soluble in water:Reactions of Tollen Reagent
100mL for Aldihyde and Ketone
Applications of Tollen Reagent
Qualitative Test for Aldehydes:
Tollens’ reagent is widely used in laboratories for the identification of
aldehydes, particularly in the context of organic synthesis and research.
Detection of Formaldehyde: It is used
to detect the presence of formaldehyde (the simplest aldehyde) in various
samples, such as in industrial chemicals or biological specimens.
Analysis of Carbohydrates:
Tollens’ reagent can also be used to test for reducing sugars since many
reducing sugars contain aldehyde groups and can react with the reagent.
Historical Use in Mirror-making:
In the past, Tollens’ reagent was used in the production of silver mirrors,
where the reaction with aldehydes would deposit silver onto glass surfaces. The
formation of the silver mirror was a hallmark of the reaction and led to its
name.
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Tollen Reagent for Aldehyde and Ketone
Limitations and Precautions:
- Instability: Tollens’ reagent is unstable and can decompose, especially if left standing for too long or exposed to light. It must be prepared fresh for accurate results.
- Non-Selectivity: While it is highly selective for aldehydes over ketones, the reagent can also react with other reducing agents, such as some alcohols, making it necessary to consider the broader chemical context when interpreting the results.
Tollens’ reagent is a powerful tool for the identification of aldehydes, and its reaction is visually striking, often producing a silver mirror on the test tube. Its selective reaction with aldehydes and inability to react with ketones make it an essential test in organic chemistry for distinguishing between these two types of carbonyl compounds.
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