Laboratory preparation of hydrogen
put a windmill on the roof
run a dc generator with the windmill
put wires from the generator in a bucket of water
collect the gasses produced by electrolysis of the water at the two electrodes. H2 at one , O2 at the other.
put a query in google
Ingenious!!! However, just in case your laboratory doesn't have a windmill or an engineer to hook up those wires, you might try mixing Zn metal with a dilute solution of HCl to get this reaction.
Zn(s) + 2HCl(aq) ==> ZnCl2(aq) + H2(g)
To prepare hydrogen in a laboratory, you can use several methods. Here are three common methods:
1. Reaction of a metal with acid:
- Choose a reactive metal such as zinc, magnesium, or aluminum.
- Add the metal to an acid, typically hydrochloric acid (HCl) or sulfuric acid (H2SO4), in a flask or test tube.
- The metal will react with the acid to produce hydrogen gas (H2) as one of the products.
- Collect the hydrogen gas by displacement or using a gas syringe.
2. Electrolysis of water:
- Set up an electrolysis apparatus consisting of two electrodes: a cathode (negative electrode) and an anode (positive electrode).
- Fill a container, such as a beaker or a test tube, with a dilute solution of sulfuric acid or sodium hydroxide. This solution serves as the electrolyte.
- Immerse the electrodes in the electrolyte solution, making sure they don't touch each other.
- Pass an electric current through the electrolyte by connecting the electrodes to a power source.
- As the electrolysis process occurs, water (H2O) molecules will break down into hydrogen gas at the cathode and oxygen gas at the anode.
- Collect the hydrogen gas by displacement or using a gas syringe.
3. Reaction of a metal hydride with water:
- Obtain a solid metal hydride compound such as sodium hydride (NaH) or lithium aluminum hydride (LiAlH4).
- Transfer a small amount of the metal hydride into a flask or test tube.
- Gradually add water to the flask or test tube, causing the metal hydride to react and release hydrogen gas.
- Collect the hydrogen gas by displacement or using a gas syringe.
Remember, when handling and conducting these experiments, proper safety precautions should be taken, including wearing goggles and working in a well-ventilated area.