What happens when (reaction and observation) :
(a) Excess carbon dioxide is passed through sodium carbonate
(b) Carbon dioxide reacts with sodium oxide
(c) Carbon monoxide reacts with ferric oxide
(d) Carbon monoxide reacts with chlorine
(e) Carbon monoxide reacts with sulphur
Answers
Answer:
a) sodium bicarbonate is formed on passing carbon dioxide in excess in aqueous solution of sodium carbonate.
b) The reaction is: 2 NaOH (s) + CO2 (g) →Na2CO3 (aq) + H2O (l) This means that solid reagent grade sodium hydroxide is not pure enough to weigh and use directly.
c) Most of the iron (III) oxide is reduced using carbon monoxide gas. This gas is a reducing agent which takes the oxygen away from iron (III) oxide. Notice that carbon monoxide gas in this reaction is changing into carbon dioxide. We call this oxidation, because each molecule of carbon monoxide gains an oxygen atom.
d) Carbon monoxide and chlorine gas react to form phosgene (COCl2) according to the equation: CO(g) + Cl2(g) → COCl2(g). The rate law for the reaction is Rate = k[Cl2]3/2[CO].
e) Carbon reacts with Sulphur to give carbon disulphide, which is an endothermic reaction, where 92kJ/mol of heat is absorbed.