Sodium chloride (NaCl), commonly known by the names table salt, rock salt, sea salt, or common salt, is a white, crystalline, hygroscopic solid with a melting point of 1081K and a boiling point of 1713K necessary chemical with a wide range of applications in both daily life and industry. Seawater contains about 2.95 percent NaCl, while brine is a concentrated 28 percent aqueous NaCl solution. Seawater is the primary source of sodium chloride, as it evaporates when exposed to sunshine. But the unprocessed salt contains impurities including calcium chloride (CaCl₂), magnesium chloride (MgCl₂), and calcium sulfate (CaSO₄).
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Sodium hydroxide (NaOH), or caustic soda, is another crucial chemical with a variety of industrial and laboratory uses. It is created by heating a solution of ferric oxide and sodium carbonate to create sodium ferrite, which is subsequently hydrolyzed to form NaOH. Other techniques include the Causticization or Gossage Method, which creates NaOH by mixing lime (CaO + Ca(OH)₂) with sodium carbonate. Sodium hydroxide (NaOH) is a white, crystalline, deliquescent solid that dissolves more readily in water than alcohol. It has a soapy texture and a melting point of 591 Kelvin.
Also read -
It is called common salt, rock salt, sea salt, or table salt. Seawater has nearly 2.95% NaCl. 28% aqueous NaCl solution is called brine.
It is mainly manufactured from seawater by evaporation in the sun. As it contains impurities of MgCl2, CaCl2, CaSO4 hence it is further purified by passing HCl gas where due to the common ion effect pure NaCl gets precipitated.
It is also known as caustic soda.
It is prepared by the following methods:
Q.1 A white sodium salt dissolves readily in water to give a solution that is neutral to litmus. When silver nitrate solution is added to the aforementioned solution, a white precipitate is obtained which does not dissolve in dil. nitric acid. The anion is :
1).CO32-
2).SO42-
3).Cl-
4).S2-
Solution:
As we learned in
NaCl→Na++Cl−→AgNO3AgCl+NaNO3 (Neutral) (White ppt) AgCl does not dissolve in HNO3
Hence, the answer is option (3).
Q.2 NaOH can be prepared by :
Electrolysis of concentrated solution of KCl
Electrolysis of concentrated solution of Na2CO3
Electrolysis of concentrated solution of NaHCO3
Electrolysis of concentrated solution of NaCl
Solution:
As we learned
Preparation of NaOH by Electrolytic method -
By electrolysis of a concentrated solution of NaCl
NaCl(aq)→Na++Cl−
At anode: 2Cl−→Cl2+2e−
At cathode: 2H2O+2e−⇌H2+2OH−
Na++OH−→NaOH
NaOH can be prepared by electrolysis of a concentrated solution of NaCl
Hence, the answer is the option (4).
Also check-
Summary of Sodium Chloride (NaCl)
Summary of Sodium Hydroxide (NaOH)
Sodium chloride is a white crystalline substance that is frequently known as table salt or just salt.
Sodium hydroxide is a white, crystalline solid that deliquesces or absorbs moisture.
Caustic soda, or sodium hydroxide, is a strong alkaline compound.
Sodium Hydroxide is a strong base that completely dissociates in water and produces sodium (Na⁺) and hydroxide (OH⁻) ions.
Sodium hydroxide is extremely corrosive in nature and can burn skin and eyes severely if, it comes into contact with it.
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