How to test hydrogen, how to test the purity of hydrogen

The first thing you can do is to ignite the gas and put a dry beaker over the flame to observe its phenomenon, if it is blue, it may be hydrogen, methane, or carbon monoxide.

Then check the product of its combustion Hydrogen: water droplets appear on the walls of the beaker.

Methane: has water droplets and produces a gas that can make the clarified lime water turbid.

Carbon monoxide: no water droplets, but produces a gas that can make the clarified lime water turbid.

1. Oxygen: Put the wooden strip with sparks in the bottle, if the wooden strip is rekindled, it is oxygen.

2. Hydrogen: ignite the gas at the glass tip, cover a dry and cold small beaker, observe whether there are water droplets on the wall of the cup, pour clear lime water into the beaker, if it is not turbid, it is hydrogen.

3. Carbon dioxide: pass into the clarified lime water, if it becomes turbid, it is carbon dioxide.

4. Ammonia: moist purple-red litmus test paper, if the test paper turns blue, it is ammonia.

5. Water vapor: through anhydrous copper sulfate, if the white solid turns blue, it contains water vapor.

6.The three bottles of test solution were dilute HNO3, dilute HCl, and dilute H2SO4

Add BA(NO3)2 dropwise to each of the three tubes

solution, if it produces a white precipitate, it is dilute H2SO4; Then add the AGNO3 solution dropwise, if the white precipitate is dilute HCl, and the rest is dilute HNO3

The small test tube is connected, the thumb blocks the test tube, moves to the fire source, lets go of the hand and hears a pop, the matter is related to the formation of water on the wall.

is hydrogen.

There is a national standard for testing the purity of hydrogen.

The device is a measuring tube, which can be quantitatively introduced with hydrogen and excess air, ignited by an electronic ignition device, so that the mixture of hydrogen and air reacts, because the reaction is very easy, the hydrogen reaction is complete, and water is generated after the reaction, and the hydrogen purity can be calculated according to the reduced volume.

The gas is passed through concentrated sulfuric acid and then through hot copper oxide, if the copper oxide turns from black to red, and the resulting gas can make anhydrous copper sulfate powder blue, it is proved to be hydrogen.

1.You can use a lit match to put it where there is hydrogen, and if it burns, it is hydrogen.

2.Add a little black cuo powder to the test tube, heat it with a gas lamp, and introduce hydrogen, and the black copper oxide will turn into purple-red metallic copper.

3.Let it burn in oxygen to see if the product can discolor anhydrous copper sulfate.

A priori pure、Then ignite、Flame above the cover of a cold and dry beaker、

The flame is blue, and water droplets are produced on the walls of the beaker

After the gas is burned for a while, the beaker is quickly put upright, and the clarified lime water is added, and the turbidity does not change, indicating that it is hydrogen.

How to test the purity of hydrogen.

<> methods to test the purity of hydrogen:

1. Collect a test tube of hydrogen with the drainage method, block the mouth of the test tube with your thumb, move the nozzle down to the flame of the alcohol lamp, release the thumb to ignite, if you hear a sharp popping sound, it indicates that the hydrogen is not pure, and it needs to be collected and tested again until you hear a slight sound, which indicates that the hydrogen has been pure.

2. If the hydrogen is collected by the downward exhaust air method, when it is tested to be impure and needs to be re-tested, it is necessary to block the mouth of the test tube with your thumb for a while, and then collect hydrogen to test the purity after the flame of the hydrogen in the test tube is extinguished, so as to avoid igniting the hydrogen in the gas generating device and occurring.

Combustion method: After burning the hydrogen, observe the color as light blue, and place a beaker on the upper side to see if there are water droplets generated, and if there is hydrogen.

Reduction method: add a little black cuo (copper oxide) to the test tube, heat it and introduce hydrogen, and the copper oxide will turn into purple-red metal. After combustion, the gas is passed into anhydrous copper sulfate, and if it turns blue, it can be judged to be hydrogen.

Explosion method: collect the hydrogen gas in the test tube and block the mouth of the test tube with your thumb. The nozzle is lowered close to the alcohol lamp flame, release your thumb, and a popping sound will be heard. In its pure state, a slight sound will be heard.

It can be considered from two aspects: physical properties and chemical properties:

1. Boiling point determination, density determination, etc.

2. After purification, ignite, cover the flame with a dry small beaker, water droplets appear on the inner wall, and then flip the beaker and pour in clarified lime water, no turbidity.

3. After purification, the dry gas reacts with the hot CuO, and the product is passed by CuSO4, anhydrous CaCl2 and clarified lime water, if the black solid turns red, the white solid turns blue, and the clear lime water is not turbid, it proves that it is hydrogen.

To test the wax of hydrogen: observe the color of the flame (light blue) and observe the combustion products (water).