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15y ago
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7y ago

No chemical can 'make' hydrogen, but thousands and thousands of compounds contain hydrogen atoms which can be, through a chemical reaction, released. An example would be sulfuric acid reacting with magnesium to form magnesium sulfate and hydrogen gas.

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12y ago

Most common way to collect H2 gas is by reacting acid with a metal :

Zn +2 HCl => ZnCl2 + H2

Electrolysis of H2O also yields H2.

I'm guessing by prepared you mean produced. The easiset way to prodduce/isolate hydrogen gas is to use electricity. To do this at home I have used a car battery charger, Two wires coated with rubber except for the ends, and a beaker filled with water. You will also need to smaller test tubes (Glass) and two stoppers to go with them. Place the car battery charger on a flat surface. Connect to the two wires. One to negative and one to positive. curve the other ends of the wires into hooks. Hook the wires around and into the two small glass test tubes. Place the test tubes upside down into the beaker filled with water. Turn on the car battery charger. The level of power doesn't really matter but the higher the power the faster this will go. The water should begin to bubble and gas should begin to fill the test tubes. After the test tubes are filled or the water stops seperating, carefully remove the wires from the test tubes and pull the tubes one at a time to the surface of the water. One at a time when at the surface,pull the tube out of the water and place the stopper into it sealing the gas inside. Do the same with the other tube. You now have one tube of pure oxygen, and one tube of pure hydrogen. The positive charge should have isolated the oxygen and the negative the hydrogen.

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9y ago

The majority of hydrogen gas produced industrially is generated as a byproduct of the petroleum industry. In other words from fossil fuels, and this process generates large amounts of carbon dioxide at the same time.

Other ways to produce it are:

  • electrolysis of water
  • thermolysis of water in contact with hot aluminum or zirconium metal
  • the reaction of strong acids (e.g. nitric, sulphuric, hydrochloric) with metals like zinc
  • etc.
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12y ago

Hydrogen is a chemical element and don't contain any other chemicals.

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14y ago

Chemicals such as Methane and even water can contain Hydrogen.

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12y ago

1. Zn + 2 HCl → ZnCl2 + H2

2. Treating of aluminum powder with NaOH or KOH solutions.

2 Al + 6 H2O + 2 NaOH → 2 NaAl(OH)4 + 3 H2

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7y ago

Other example is the reaction between alkali metals and water.
Also by hydrolysis hydrogen is obtained from water and sodium hydroxide.

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12y ago

Zn + HCl = ZnCl + H2

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Q: How is hydrogen prepared in the lab?
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