Consider the following substances:
NaCl, Ca(OH) 2 , NaHCO 3 , NH 3 , Na 2 CO 3 .10H 2 O, H 2 O, Cl 2 , CO 2 , CaSO 4 .2H 2 O, 2CaSO 4 .H 2 O, CaOCl 2
a) Which two substances combine to form bleaching powder?
b) Which four substances are utilised in the production of washing soda?
c) Which compound represents plaster of Paris?
d) Which compound is the main constituent of baking powder?
e) Which sodium compound is used for softening hard water?
Answers
Explanation:
HEY MATE
A.) Solution. Ca(OH)2 combines with Cl2 to give bleaching powder (CaOCl2 )
B.) Washing soda is synthesized through Solvay’s process. Solvay’s process involves the reaction of sodium chloride, ammonia and carbon dioxide in water. Carbon dioxide involved is produced through calcium carbonate and the calcium oxide left is used in recovering ammonia from ammonium chloride.
C .The name plaster of Paris came from the fact that it was first of all made by heating gypsum which was mainly found in Paris. The compound plaster of Paris is prepared by heating gypsum at 120oC.CaSO4.2H2O → CaSO4.1/2H2O + 3/2H2OThe chemical formula for the plaster of Paris is (CaSO4) H2O and is better known as calcium sulfate hemihydrate
D.) The constituent present in baking powder is tartaric acid.Baking powder contains basic sodium hydrogen carbonate which is neutralized with tartaric acid.