Properties of water right? okay as we know water is a very important chemical for us and other living beings. Without water, we cannot survive.
It exists in all three states on the earth’s surface and in the atmosphere.
On earth, It exists as underground water and surface water.
Snow in the Himalayan region and polar regions, ocean, rivers, ponds, lakes, and streams are some examples of surface water.
Streams, artesian, wells, hand pumps, roar pumps, well, etc are some means which bring underground water on the earth surface for our use.
Plants use it during the photosynthesis process and animals drink it as it is the main part of their food.
Water is used for many other purposes in our daily life. Its molecular formula is H2O.
Properties of water
A. Physical properties
Some physical properties of water are as follows,
1. It is clear that is transparent.
2. Pure water is tasteless, orderless and colourless
3. They exist in three states. Solid, liquid and gas i.e ice, water and clouds respectively.
4. It changes its temperature very slowly. Due to this property, we use it in hot water bags to heat and in the radiators of vehicles to cool hot engines.
5. It freezes at 0° Celsius and boils at 100° Celsius at normal atmospheric pressure.
6. It is a universal solvent as it can dissolve many solutes within it. This property makes it useful for cleaning purposes.
7. When it is heated, it contracts from 0° to 4° c and beyond 4°C, it expands. This character is called the anomalous expansion of water.
8. It is rarely found pure because it dissolves many substances in it.
B. Chemical properties
There are the chemical properties of water mentioned below,
1. It is neutral to an indicator. Therefore it is neither basic nor acidic and PH (percentage of hydrogen) is 7.
2. It forms ammonium hydroxide when it reacts with ammonia gas.
H2O + NH3 —–> NH4OH
3. It forms carbonic acid when it reacts with carbon dioxide
H2O + CO2 ——> H2CO3
4. It forms alkali when metallic oxide dissolves in it.
Cao + H2O ——> Ca(OH)2
5. It makes alkali and hydrogen when alkali metal reacts with it.
2k + H2O ——–> 2KOH + H2
6. It is ionized when it is dissolved with an acid, base or salt.
H2O <———–> H^+ + OH^-
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