Question

state the laboratory preparation of water

Answer 1

Apparatus Required:

Two jars or beakers with lids, Glass tube (having openings at both ends), Capillary tube, Utensil (large enough to hold jar and ice), Burner.

Explanation:

Fill one jar with ordinary tap water. Cover it with the lid. This lid must have an opening to insert the glass tube in it. Place second jar inside the utensil. This second jar should be covered with the lid having two holes in it. Now, insert a glass tube through lids of both jars to connect them with each other. Insert a small capillary tube into empty hole of lid of second jar to make it act like a chimney for steam. Second jar must be covered with ice from outside. Ice will act as a condenser for incoming steam. The tube connecting both jars must be going deep inside the second jar.

Now, boil the water of first jar. The steam will rise and enter into the second jar through the glass tube. It will get condensed into pure distilled water. Extra steam will escape through the capillary tube. The process of distillation is very slow and takes time. Therefore, one should be patient during the process.

Precautionary Measures:

– Steam can cause serious burns. Be careful.

– Use jars or beakers made from glass which can tolerate high temperature of flame and steam.

Answer 2

Laboratory preparation of water:

In order to absorb any potential water vapor, pure hydrogen gas is passed over anhydrous calcium chloride in this process. The dry hydrogen that emerges from the opening is then burnt when there is enough air present. Water vapor is produced when the burning hydrogen gas makes contact with the cold flask. This process results in distilled water that has no dissolved contaminants.

When was water first prepared in the laboratory:

The first person to prepare water was an English scientist named Henry Cavendish in 1781. He found hydrogen gas during this experiment when active metals and sulphuric acid interacted. When the highly combustible hydrogen gas was liberated, it burned to produce the colorless material known as water. Additionally, he created carbon dioxide by combining metals with potent bases.

The preparation of water is done using the following procedures:

• hydrogen reduction of metal oxide.
• airborne hydrogen combustion.
• airborne burning of hydrocarbons.
• Both plants and animals exhale water as they breathe.

$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + Energy$

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