Some uses of sodium carbonate is/are:

A
We can use sodium carbonate in making water glass, sodium phosphate, borax etc.
B
In the laboratory, it is used as a reagent that is used to standardise acids.
C
In the process of making silica, sodium carbonate functions as a flux.
D
All of the above

Solution:

concept - The given formula (

{Na}_{2} C O_{3}

) represents Sodium carbonate. It can be categorised as an inorganic compound. All sodium carbonate hydrates are referred to as soda ash.
Sodium carbonate is typically prepared using the Solvay process. In the Solvay process, ammonia and carbon dioxide are converted into a saturated sodium chloride solution (maintained at a relatively low temperature). This triggers certain chemical reactions that result in the formation of sodium bicarbonate. This compound is only slightly soluble in the presence of sodium ions (due to the common ion effect). Therefore, the sodium bicarbonate is almost completely precipitated.
Its uses are:
●       The major use of sodium carbonate is in the making of water glass, sodium phosphate, borax etc.
●       In the laboratory, it is used as a reagent that is used to standardise acids.
●       sodium carbonate is used as a flux in making silica.
●       We can use it in modifying pH.
●       It is also used in the manufacturing of paper, soaps and detergents.
Hence, the correct option is (4).

Solution:

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