Hardness of water is a situation whereby water does not lather well with soap which is causes by dissolution of some salts like CaSO4 and MgSO4 in the water.
(i) It causes furging of kettles and boilers.
(ii) It causes waste of soap and water.
(4bi) Ammonia NH3, OxygenO2
(4bii) Ammonia is poured over heated platinum rhodium catalyst at 700°c to produce NO and steam which then in the presence of excess air gives NO2. It is then sprayed with hot water to form HNO3
(4biii) S + HNO3 —> H2SO4(aq) + H2O(l) + 6NO2(aq)
Aluminum does not react with conc. HNO3 due to the formation of protective coating of oxide on the metal.
Al2O3 Aluminium oxide.
???? Carbon dioxide is colorless
.???? At low concentrations the gas is odorless;
???? Carbon dioxide is an acidic oxide and reacts with water to give carbonic acid.
???? Carbon dioxide reacts with alkalis to give carbonates and bicarbonates. =========================
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