Laboratory Hydrogen Laboratory made Methods for producing hydrogen in the laboratory

2. The active nature of metals has a **, and the metals before H are of course, of course, some particularly active metals need to be removed, such as sodium, potassium, calcium, all of which are OK, magnesium and the like.

Nitric acid cannot be used, because nitric acid has strong oxidizing properties, and there are gases such as NO2 and NO2 when generating hydrogen.

3.Generally, hydrogen production will carry water, and it can be used through concentrated sulfuric acid, soda lime and other desiccants that can absorb water but will not react with H2.

4.Hydrogen is less dense than air and can be vented downward.

5.Use a lit matchstick to move it to the mouth of the gas collection cylinder, and if you hear a popping sound, it is hydrogen.

If you really want to write the equation, it's the H2 and O2 reactions.

2H2+O2=2H2O (Condition: Ignite).

Upstairs, if the hydrogen is not pure and ignites, it will happen**. The hydrogen obtained from the experiment is generally impure and always carries some impurities.

It is best to use zinc and dilute sulfuric acid to produce hydrogen, magnesium and aluminum are too fast than zinc active reaction, and nitric acid can not be oxidized too strongly to get hydrogen!

Potassium, calcium, sodium, magnesium, aluminum, tin, lead (junior high school), nitric acid cannot be used to pass the generated gas into concentrated sulfuric acid to remove impurities.

Use the drainage method or the downward exhaust air method.

Verify that the gas ignites the gas and then places a dry, cold beaker on top of the flame, and then if there are water droplets, the gas contains hydrogen. Then immediately pour the alkaline earth metal hydroxide solution into the solution, if the solution is not turbid, it means that there is no CO2 formation, that is, the gas does not contain carbon elements. This verifies that it is hydrogen.

Here's how hydrogen is produced in the laboratory:

Method 1: Reaction of zinc with dilute sulfuric acid to generate hydrogen, chemical reaction formula: Zn + H2SO4 = ZnSO4 + H2 (hydrogen), the principle of this method is mainly to use zinc elements with stronger metal activity than hydrogen to react with sulfuric acid to replace hydrogen elements to generate hydrogen, which is the most commonly used way to produce hydrogen in the laboratory at present.

Method 2: Hydrogen is generated by the reaction of zinc and salt crude comic acid, the chemical reaction formula: 2Zn + 2HCL = 2ZNcl + H2 (hydrogen), the principle of this method is to use zinc elements with stronger metal activity than hydrogen to react with hydrochloric acid to replace hydrogen elements to generate hydrogen.

Method 3: Hydrogen is prepared by reaction of aluminum and sodium hydroxide solution, 2Al+2NaOH+2H2O=2Naalo2+3H2 (hydrogen), the principle of this method is mainly to use aluminum element, which is more active than hydrogen, to react with sodium hydroxide to replace hydrogen elements.

Method 4: Hydrogen is produced by electrolysis of water, chemical reaction formula: 2H2O = O2 + 2H2 (hydrogen), the principle of this method is mainly to use electric energy to ionize hydrogen elements and hydrogen elements, and the ionized hydrogen elements generate hydrogen, the cost of this method is high, and it is not recommended to use.

Summary: The main methods for producing hydrogen in the laboratory are zinc and rock dilute sulfuric acid, zinc and hydrochloric acid, aluminum and sodium hydroxide, and water electrolysis.

The equation for laboratory chemistry is: Zn+H2SO4=ZnSO4+H2.

There are two ways to produce hydrogen in chemical laboratories, one is by electrolysis of water.

to produce hydrogen (H2) and also produce oxygen.

The chemical equation is: 2H2O (energized)2H2 DecaO2. The other is to use specific hydrogen elements.

It is a reactive metal element, which undergoes a displacement reaction with acid.

The equation for this type of reaction is: Zn deca 2HCl Znc 2 dec H2 , Fe deca H2SO4 FeSO4 dec H2 .

<> commonly used in chemistry to carry the device:

1. Solid heating device; It is used for two or more solid chemical reactions and requires heating.

2. Solid and non-heating device; It is used for two or more solid chemical reactions and does not require heating.

3. Solid-liquid heating device; It is used for one or more solid chemical reagents and another or more liquid chemical reagents and reactions, and requires heating.

4. Solid-liquid non-heating device; It is used for one or more solid chemical reagents and another or more liquid chemical reagents and reactions, and does not require a shortage of heat.

Here's how:

Laboratory preparation method of hydrogen: Fe + H2SO4 = FeSo4 + H2

Industrial production of hydrogen:

1. Water gas method (main components CO and H2), reaction principle: C + H2O = CO + H2, reaction conditions are high temperature.

2. Electrolyzed water.

The method of hydrogen production, the reaction principle: 2ho = O2 + 2H2, the reaction condition is energized.

3. Electrolysis of saturated saline water, reaction principle: 2NaCl + 2H2O = 2NaOH + H2 + Cl2, the reaction condition is energized.

Hydrogen of this purity is often supplied:

Reducing agent used in the electronics, instrumentation and meter industry.

shielding gas and p-permalloy.

heat treatment, etc.; Tungsten, molybdenum, and cemented carbide are produced in the powder metallurgy industry.

reducing agent for other purposes; Preparation of polysilicon.

germanium and other semiconductor raw materials; hydrogenation of fats and fats; Cooling gas in dihydrogen internal coolant generators, etc. Hydrogen is produced by electrolysis of saturated brine, such as 2NaCl + 2H2O = = energized = = 2NaOH + Cl2 + H2.

Summary. Hello dear to expand knowledge, first according to the reaction principle to find out the reactants, products, reaction conditions, according to the chemical equation writing methods, steps to write the first one, with zinc and dilute sulfuric acid reaction to generate hydrogen, chemical reaction formula: zn + h2SO4 = znSO4 + H2 (hydrogen), the principle of the method is mainly to use the metal activity is stronger than hydrogen zinc element reaction with sulfuric acid, replace the hydrogen element to generate hydrogen, the method is currently the most commonly used way to produce hydrogen in the laboratory.

The second is to react with zinc and hydrochloric acid to generate hydrogen, the chemical reaction formula: 2zn+2HCl=2znCl+H2 (hydrogen), the principle of this method is mainly to use zinc element, which is stronger than hydrogen, to react with hydrochloric acid to replace hydrogen elements to generate hydrogen. The third is to react with aluminum and sodium hydroxide solution to produce hydrogen, and the chemical reaction formula:

2al+2naoh+2h2o=2naalo2+3h2 (hydrogen), the principle of this method is mainly to use aluminum elements with stronger metal activity than hydrogen to react with sodium hydroxide to replace hydrogen elements to generate hydrogen.

Hello dear to the laboratory, zinc and dilute sulfuric acid are often used to produce hydrogen, zinc and dilute sulfuric acid react at room temperature to produce zinc sulfate and hydrogen megab, the chemical equation of the reaction is: zhengbei zn+h2SO4 znSO4+H2 So the answer is: zn+h2SO4 znSO4+H2

Hello dear to expand knowledge, first find out the reactants, products, and reaction conditions according to the reaction principle, and write according to the writing method and steps of the chemical equation First, the reaction of zinc and dilute sulfuric acid to generate hydrogen, chemical reaction formula: Zi socks Zn + H2SO4 = ZnSO4 + H2 (hydrogen), the principle of this method is mainly to use zinc elements with stronger metal activity than hydrogen to react with sulfuric acid to replace hydrogen elements to generate hydrogen, which is the most commonly used way to produce hydrogen in the laboratory at present. The second is to react zinc with hydrochloric acid to produce hydrogen, and the chemical reaction formula:

2zn+2HCl=2znCl+H2 (hydrogen), the principle of this method is mainly to quietly use zinc elements with stronger metal activity than hydrogen to react with hydrochloric acid to replace hydrogen elements to generate hydrogen. The third is to react with aluminum and sodium hydroxide solution to produce hydrogen, the chemical reaction formula: 2Al + 2NaOH + 2H2O = 2Naalo2 + 3H2 (hydrogen), the principle of the book rolling method is mainly to use the aluminum element with stronger metal activity than hydrogen to react with sodium hydroxide to replace the hydrogen element to generate hydrogen.

The first is to react with zinc and dilute sulfuric acid to generate smooth hydrogen, chemical reaction formula: Zn + H2SO4 = ZnSO4 + H2 (hydrogen), the principle of this method is mainly to use zinc elements with stronger metal activity than hydrogen to react with sulfuric acid to replace hydrogen elements to generate hydrogen, which is the most commonly used way to produce hydrogen in the laboratory at present.

The second is to react with zinc and hydrochloric acid to generate hydrogen, the chemical reaction formula: 2zn+2HCl=2znCl+H2 (hydrogen), the principle of this method is mainly to use zinc element, which is stronger than hydrogen, to react with hydrochloric acid to replace hydrogen elements to generate hydrogen.

The third is to react with aluminum and sodium hydroxide solution to produce hydrogen, the chemical reaction formula: 2Al+2NaOH+2H2O=2Naalo2+3H2 (hydrogen), the principle of this method is mainly to use aluminum element, which is more active than hydrogen, to react with sodium hydroxide to replace hydrogen elements to generate hydrogen.

The third is to use water electrolysis to produce hydrogen, chemical reaction formula: 2H2O = O2 + 2H2 (hydrogen), the principle of this method is mainly to use electric energy to ionize hydrogen elements and hydrogen elements, ionized hydrogen elements to generate hydrogen, the cost of this method is high, it is not recommended to use.

Summary: There are four main methods for the positive disturbance of hydrogen slag prepared in the laboratory: zinc and dilute sulfuric acid reaction, zinc and hydrochloric acid reaction, aluminum and sodium hydroxide reaction, and water electrolysis.