CBSE Class 10 Science 2019 · Paper 31/1/1 · Question 7
Identify the acid and the base from which sodium chloride is obtained. Which type of salt is it? When is it called rock salt? How is rock salt formed?
Answer
Sodium chloride comes from hydrochloric acid and sodium hydroxide, is a neutral salt, and forms rock salt beds when seas dry up.
Sodium chloride is obtained from hydrochloric acid (HCl, the acid) and sodium hydroxide (NaOH, the base): .
It is a neutral salt (from a strong acid and a strong base; pH ).
Solid sodium chloride found in deposits as large crystals, often brown because of impurities, is called rock salt.
Beds of rock salt were formed when seas of bygone ages dried up.
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