Abstract
Phosphotungstic acid has two hydrates-both cubic-whose structures were recently determined by Keggin. If the acid is crystallized out of solution it forms a 29-hydrate which loses water when exposed to the air. A 5-hydrate is formed when the 29-hydrate is dehydrated over P
2
O
5
until constant weight is reached. Keggin's structure for the 5-hydrate led to the formula H
3
PW
12
O
40
. 5H
2
O. Other workers proved that silico-, boro-, and metatungstic acids, when dehydrated over P
2
O
5
, also formed 5-hydrates with similar structures, their formulae being H
4
SiW
12
O
40
. 5H
2
O, H
5
BW
12
O
40
. 5H
2
O, and H
6
H
2
W
12
O
40
. 5H
2
O. The object of the present research was to examine the structures of salts of these acids. A beginning was made with caesium salts mainly because it was anticipated that the heavy caesium atoms would be more readily located.
Cited by
23 articles.
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