Hydrogen bromide gas is gaseous at room temperature and pressure, and its density is about 3.4 times that of air. It is easily soluble in water, slightly soluble in alcohol, insoluble in ether.
At high temperature, hydrogen bromide gas reacts with metal to form bromide, while at temperatures below 180 ° C, hydrogen bromide gas has similar compatibility with electrical structural materials as nitrogen gas.
Hydrogen bromide (HBr) is a colorless, highly toxic and corrosive gas. In the laboratory, the following methods are commonly used to test the purity of hydrogen bromide gas:
1. Observation of gas properties: hydrogen bromide gas is colorless and transparent with pungent odor. In the experiment, its purity can be judged by observing the color and odor of the gas.
2. Gas concentration detection: hydrogen bromide gas can be detected by concentration detection instruments, such as gas concentration sensors, gas chromatograph, etc. By detecting the concentration of the gas, it can be judged whether the purity meets the requirements.
3. Gas melting method: put the sample to be tested into the quartz melting tube and heat it to a certain temperature to make it fully melt. Then, pour the molten liquid into the test tube, add the appropriate amount of water, and observe its color and state after mixing with water. If the color and state are the same as that of pure hydrogen bromide, it indicates that the sample is of high purity.
4. Gas chromatography: the samples to be tested are sent into the gas chromatograph, separated by the chromatographic column, and then the content of each component is detected by the detector. According to the content of each component and the chromatographic peak area, the purity of hydrogen bromide can be calculated.
5. Solution detection method
The gas is dissolved in water to obtain an aqueous solution.
The solution was tested with pH dipsticks and was acidic, indicating the presence of H(+).
With silver nitrate solution, a yellow precipitate was formed, which was not soluble in nitric acid, proving the existence of Br(-).
Through the above steps, the purity of hydrogen bromide gas can be detected.
The above method is only suitable for the detection of high purity hydrogen bromide.
If low purity hydrogen bromide needs to be detected, other more sensitive detection methods, such as conductance method, infrared method, atomic absorption method, etc., need to be used.
At the same time, when detecting hydrogen bromide gas, attention should be paid to safety protection to avoid inhalation or contact with excessive hydrogen bromide, which will cause harm to human body.
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