What Is Bromine Water Test?

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

What Is Bromine Water Test?

Chemical tests play a pivotal role in the world of science, aiding in the identification and analysis of various substances. Among these tests, the Bromine Water Test stands out as a valuable tool for detecting the presence of unsaturation in organic compounds. Let’s embark on a journey into the realm of chemistry to unravel the principles, procedures, and significance of the Bromine Water Test.

Understanding Unsaturation:

Before delving into the Bromine Water Test, it’s essential to grasp the concept of unsaturation in organic compounds. Unsaturated compounds are those that contain double or triple bonds between carbon atoms. These bonds result in a degree of reactivity, making unsaturated compounds prone to reactions that can alter their structure.

Principles Of The Bromine Water Test:

The Bromine Water Test specifically targets the unsaturation present in organic compounds, providing a means to identify the presence of double or triple bonds. The test relies on the reaction between bromine water (a solution of bromine gas in water) and unsaturated compounds.

Bromine (Br₂) is a reddish-brown liquid at room temperature, and its reaction with unsaturated compounds involves the addition of bromine across the double or triple bond. This reaction results in the decolorization of the bromine water, changing it from reddish-brown to colorless.


The Bromine Water Test is relatively straightforward and involves the following steps:

  • Prepare Bromine Water:

Create a solution of bromine water by dissolving bromine (Br₂) in water. This results in a reddish-brown solution.

  • Add the Organic Compound:

Introduce the organic compound being tested to the bromine water. If the compound is unsaturated (contains double or triple bonds), a chemical reaction will occur.

  • Observe Color Change:

Monitor the color of the bromine water. If the compound is unsaturated, the bromine will add across the double or triple bond, causing the bromine water to lose its reddish-brown color and become colorless.

Significance In Organic Chemistry:

The Bromine Water Test is particularly valuable in organic chemistry for the identification and differentiation of saturated and unsaturated compounds. Saturated compounds, lacking double or triple bonds, do not react with bromine water, and thus, the reddish-brown color persists.

On the other hand, the decolorization of bromine water indicates the presence of unsaturation in the tested compound. This test is commonly used to distinguish between alkanes (saturated hydrocarbons) and alkenes (unsaturated hydrocarbons) or alkynes (unsaturated hydrocarbons with a triple bond).

Limitations And Considerations:

While the Bromine Water Test is a useful tool, it is important to note that certain compounds may not react as expected due to various factors. Additionally, the test is more specific to alkenes and alkynes, and other functional groups may not show a visible reaction.


The Bromine Water Test stands as a classic example of chemical analysis, allowing chemists to unravel the structural characteristics of organic compounds. Its simplicity, specificity, and the visual nature of the reaction make it a valuable tool in the toolkit of organic chemists, aiding in the exploration and understanding of the diverse world of carbon-containing molecules.


What Is Bromine Water Analysis?

Bromide is detected using a sensor called an ISE (ion selective electrode). Bromide is found in seawater, brine water and rock formation water. Bromide is a bromine atom with an ionic charge of -1 (Br-). In seawater its concentration is commonly measured at 65 mg/l.

What Is A Positive Result For Bromine Test?

The sample solution remains colorless if an unsaturated compound is present. It turns red/brown if only saturated compounds are present. The degree of unsaturation of a compound can be determined by slowly adding bromine solution until the first red/brown color is observed.

What Is Bromine Water Used To Distinguish?

Hence, the Bromine-water test is used to distinguish saturated hydrocarbons, unsaturated hydrocarbons, and Phenols.

What Does Bromine Water Contain?

Keep the bottle capped when not in use Bromine water is a highly oxidizing intense yellow to red mixture containing diatomic bromine (Br2) dissolved in water (H2O).

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