Question

Name the major salt which is present in sea-water.

Answer 1

Hint: Seawater or saline water, naturally is water an ocean or a sea. It is denser than the fresh water because its mass gets increased significantly by the presence of various salts in it. The most abundant salt present in the sea water, is the same salt that we use generally for the cooking purpose.

Complete answer:
Sea water contains chlorides, bromides and iodides of $Na,K,Ca,Mg$ but mainly it contains $NaCl$ $(2.5% by mass)$. Therefore, we can interpret that sodium chloride is the most abundant salt which is present in the sea water. It is also referred to as table salt.
We should remember that sodium chloride dissolves in water into its corresponding ions that are Sodium and chlorine ions and these ions are present in more abundant quantities as compared with other ions present in the sea water. If we talk about specific composition then sodium and chloride ions together constitute 85 per cent of all the ions dissolved in seawater.
The major source of the salt in the seawater are the rocks. Whenever there is heavy rainfall, it leads to the erosion of rocks. Due to this erosion, ions are released from the rocks which are eventually drained off in the sea water, thus making it salty.
Sodium chloride or table salt can be obtained from the sea water by the process of evaporation. The sodium chloride obtained after the evaporation is purified and after that. It is available on the markets.
Sodium chloride is used in every household, for enhancing the flavor of our daily meals. It is thus a staple salt also.

Note: It should be noted that the concentration of salt in sea water which is also termed as salinity changes with change in temperature and precipitation. The average salinity account for about thirty- five parts per thousand. Salinity is highest at the mid-latitudes and low at the poles.