B. Preparations and properties of
i. NaCl
ii. NaOH by Chlor Alkali process
iii. Quick lime
iv. Slaked lime
v. plaster of pairs
Answers
NaCl is prepared by mixing of NaOH and HCl
so that we get NaCl and H2O
so.....
Sodium chloride is obtained by mining the deposits and brine solution is obtained by passing water into the deposits. Hence the salts get dissolved then the solution is pumped out. Evaporation of the sea water is one of the major processes used to obtain salt and is most widely followed in countries like India.
main property of NaCl is it is used as table salt after purification
The chlor-alkali industry uses brine (salt water) to produce chlorine, sodium hydroxide (NaOH or caustic soda), and hydrogen. An electric current is passed through the brine, to form hydrogen gas at the negative electrode and chlorine gas at the positive electrode, leaving a solution of sodium hydroxide.
What are some uses of sodium hydroxide?
a. It is major ingredient in drain and oven cleaners.
b. It is used in chemical manufacturing, oil refining, hydraulic fracturing, water treatment and metal processing.
c. It is used in the manufacture of fabric, plastic wrap, paper and soap.
Calcium oxide or lime is prepared by the process called calcination. Calcium carbonate or Limestone is heated to a temperature between 1250 ⁰C and 1400 ⁰C in Kilns (oven) and it decomposes to quicklime
Uses of Calcium Oxide :-
It is extensively used for medicinal purposes and insecticides. It finds its application in the manufacturing of cement, paper, and high-grade steel. Lime is used as a reagent in laboratories for dehydration, precipitation reaction, etc.
Slaked lime is prepared by the following methods: (i) From quick lime: By treating quicklime with water, slaked lime is formed. When water is added to quicklime, a huge amount of heat is produced along with the hissing sound.
uses of slaked lime are
used chiefly in mortars, plasters, and cements, in bleaching powder, and in the manufacture of steel
plaster of paris
Plaster of Paris is prepared by heating gypsum at 373 K. On heating, it loses water molecules and becomes calcium sulphate hemihydrate (CaSO4. 1/2 H2O) which is called Plaster of Paris.
uses of plaster of paris
a.. It is commonly used to precast and hold parts of ornamental plaster work placed on ceilings and cornices.
b.. It is also used in medicine to make plaster casts to immobilize broken bones while they heal, though many modern orthopedic casts are made of fibre glass or thermoplastics.
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