Synthetic Inorganic Chemistry
GENERAL QUESTIONS IX 297
GENERAL QUESTIONS IX
- Arrange a table of the dioxides of the elements of Group IV:
column 1, the formulas of the dioxides, placing those of the A
family at the left and those of the B family at the right of the
column; column 2, the character of the dioxide specifying, a. =
distinctly acidic, w. a. = weakly acidic; ind. = indifferent; w.b.=
weakly basic; b. = distinctly basic; amph. = amphoteric; column
3, the formula of as well denned a salt as possible of the dioxide;
column 4, the extent of hydrolysis of this salt, specifying much,
little, or none.
- Make a similar table embracing the lower oxides, CO, SnO,
Ce 2 O 3 , PbO.
- Make a table for the tetrachlorides of all the elements of
Group IV: column 1, the formula of thetetrachloride; column 2,
its state of aggregation, specifying, gas, liquid, or solid; column 3,
its boiling point at atmospheric pressure, specifying dec if it de-
composes before the boiling point is reached; column 4, the equa-
tion for its reaction with a large amount of water.
Judging from the decreasing metallic properties in the series, Pb,
Sn, Si, C, we should expect the tetrachlorides to hydrolyze more
readily as we progress in this order. Two factors modify this
effect: the tendency to form a complex acid such as H^SnCle with
the anion SnCl 6 ~~, and the insolubility or total lack of ioniza-
tion of the tetrachloride. Explain from this point of view why
carbon tetrachloride and carbon disulphide are without perceptible
action with water.
- Find out what elements of Group IV form carbonates, and
give the formulas of the carbonates and approximately their
relative stability.
- What is a thio-salt? Describe how a thio-salt of tin can be
formed, and discuss its properties and its relation to the corre-
sponding oxy-salt.
