What Is Tollens Reagent?

Are you curious to know what is tollens reagent? You have come to the right place as I am going to tell you everything about tollens reagent in a very simple explanation. Without further discussion let’s begin to know what is tollens reagent?

Tollens’ Reagent, a powerful chemical tool, plays a significant role in chemistry, particularly in identifying aldehydes. This article aims to unravel the mysteries surrounding Tollens’ Reagent, discussing its formula, applications in Class 12, preparation methods, and reactions with aldehydes.

What Is Tollens Reagent?

Tollens’ Reagent, also known as silver mirror test reagent, is a solution commonly employed in chemistry to detect the presence of aldehydes. It is named after the German chemist Bernhard Tollens, who developed this reagent in the 19th century. The primary component of Tollens’ Reagent is silver nitrate (AgNO₃), making it a key player in qualitative analysis.

What Is Tollens’ Reagent Formula?

The formula of Tollens’ Reagent is Ag(NH₃)₂⁺. This complex ion is formed when silver nitrate reacts with ammonia, and it is this formula that imparts the distinctive properties to the reagent.

What Is Tollens’ Reagent Class 12?

In Class 12 chemistry, Tollens’ Reagent holds paramount importance. It is extensively used for practical experiments and demonstrations, allowing students to witness the unique reactions of aldehydes in a controlled environment. Understanding its applications at this academic level is crucial for a comprehensive grasp of organic chemistry.

What Is Tollens Reagent Used For?

Tollens’ Reagent is primarily employed in the identification of aldehydes. The reagent reacts with aldehydes to produce a silver mirror on the inner surface of the reaction vessel. This distinct silver mirror is a result of the reduction of silver ions by aldehydes.

Tollens’ Reagent Name:

The reagent is named after Bernhard Tollens, the renowned chemist who developed it. The name ‘Tollens’ Reagent’ is widely recognized in scientific literature and is synonymous with the silver mirror test reagent.

How Is Tollens Reagent Prepared?

Tollens’ Reagent is prepared by mixing silver nitrate (AgNO₃) with ammonia (NH₃). The reaction results in the formation of the complex ion Ag(NH₃)₂⁺. The reagent should be prepared freshly, as it is sensitive to light and can decompose over time.

What Is Tollens Reagent: Explain Its Reaction With Aldehydes:

Tollens’ Reagent reacts uniquely with aldehydes in a process known as Tollens’ Test. Aldehydes act as reducing agents in this reaction, reducing the silver ions in the reagent to metallic silver. This reduction leads to the formation of a silver mirror on the inner surface of the reaction vessel.

Tollens’ Reagent Reaction:

The reaction between Tollens’ Reagent and aldehydes can be represented as follows:

\text{2Ag(NH₃)₂⁺} + \text{RCHO} + 3OH^- \rightarrow \text{2Ag} + \text{RNH₂} + \text{HCO₃^-} + \text{4NH₃}

Here, RCHO represents the aldehyde, and OH⁻ denotes the hydroxide ions.

What Is Tollens Reagent And Its Use:

In summary, Tollens’ Reagent is a crucial tool in organic chemistry, particularly in Class 12 studies. Its ability to selectively react with aldehydes, producing a distinct silver mirror, makes it a valuable asset in identifying and confirming the presence of aldehydes in various chemical reactions.


Tollens’ Reagent, with its fascinating reactions and applications, continues to be an indispensable component of the chemist’s toolkit. Whether you’re a student exploring the wonders of organic chemistry or a researcher in the field, understanding the intricacies of Tollens’ Reagent opens doors to a deeper comprehension of aldehyde identification and related chemical processes.


Is Tollens Reagent A Reducing Agent?

Tollens’ reagent is a mild oxidizing agent that can selectively oxidize aldehyde to their respective acid and themselves getting reduced to elemental silver precipitate forming a silver mirror coating on the walls of the container/test tubes.

What Is The Tollens Reagent?

Tollens’ reagent is a chemical reagent used to determine the presence of an aldehyde, aromatic aldehyde and alpha-hydroxy ketone functional groups. The reagent consists of a solution of silver nitrate and ammonia.

What Are Tollens And Fehling Reagents?

Ammonium silver nitrate is tollen’s reagent and it is mild oxidative agent. All the aldehyde give positive result. Fehling’s test: This test is used to detection of reducing sugar. It contain two solution Fehling’s solution A and Fehling’s solution B.

What Is Tollens Test Positive For?

Aldehydes and α− hydroxy ketones give positive Tollen’s test.

I Have Covered All The Following Queries And Topics In The Above Article

What Is Tollens’ Reagent Formula

What Is Tollens’ Reagent Class 12

What Is Tollens Reagent Used For

Tollens’ Reagent Name

How Is Tollens Reagent Prepared

What Is Tollens Reagent Explain Its Reaction With Aldehydes

Tollens’ Reagent Reaction

What Is Tollens Reagent And Its Use

What Is Tollens Reagent