what are the uses of sodium?

Answer 1

Sodium in its metallic form can be used to refine some reactive metals, such as zirconium and potassium, from their compounds. This alkali metal as the Na+ ion is vital to animal life. Other uses:

In certain alloys to improve their structure.
In soap, in combination with fatty acids. Sodium soaps are harder (higher melting) soaps than potassium soaps.
To descale metal (make its surface smooth).
To purify molten metals.
In sodium vapor lamps, an efficient means of producing light from electricity (see the picture), often used for street lighting in cities. Low-pressure sodium lamps give a distinctive yellow-orange light which consists primarily of the twin sodium D spectral lines. High-pressure sodium lamps give a more natural peach-colored light, composed of wavelengths spread much more widely across the spectrum.
As a heat transfer fluid in some types of nuclear reactors and inside the hollow valves of high-performance internal combustion engines.
NaCl, a compound of sodium ions and chloride ions, is an important heat transfer material.
In organic synthesis, sodium is used as a reducing agent, for example in the Birch reduction.
In chemistry, sodium is often used either alone or with potassium in an alloy, NaK as a desiccant for drying solvents. Used with benzophenone, it forms an intense blue coloration when the solvent is dry and oxygen-free.

Answer 2

Also Na is used extensively in organic synthesis as an agent to form the alkoxide ion.

2ROH + 2Na --> 2RONa +H2(g)

Answer 3

Many, this is not the forum for it.

Just too many.

you already have so many.

But here is few more.

Water softener.
Road ice melt.

Answer 4

cooking, to add salty flavor
keep ice cream cooled
to melt ice on the streets
to maintain temperature
science experiments
test plasmolysis/cytolysis on cells, and how they react to different environments.

Answer 5

TASTES GREAT + LESS FILLING