142 Chemistry and Chemical Arts. 
position. It crystallizes by evaporation; its crystals are not deli- 
quescent; at an elevated temperature, it is entirely decomposed 
and passes to the state of iodic acid. Hydrochloric acid transforms 
it into iodic acid with the liberation of chlorine. According to the 
composition of the salts which it forms with silver, it is found to con- 
tain seven atoms of oxygen and two atoms of iodine. 
The neutral hyper-iodate of potash in little white crystals, slightly 
soluble and similar to the hydrochlorate of potash, is converted into 
iodide by calcination ; it contains : 
Iodide of potassium, 5 : ; : 0.72108 
Oxygen, , i : 0.27892 
The sub-iodate has che same isctilitiay as the neutral salt; it con- 
tains : 
Potassa, : { 4 : p : 0.17059 
lodide of potassium, ; : : : 0.59807 
Oxygen, ‘ : ~ 0.23134 
The neutral hyper-iodate of cide is easily soluble in water, and 
uncrystallizable. It is converted into iodide by calcination, and 
contains : 
Iodide of sodium, . ‘ é ‘ : 0.80018 
Oxygen, ‘ ‘ ‘ 0.19982 
- The basic pymeninl ae is alot jaseublen in cold water, but it is 
slightly soluble in warm water, and very soluble in dilute nitric acid: 
this salt possesses the remarkable property of giving up only three 
fourths of its oxygen at a white heat; it contains: 
Sodas... : ‘ : : : ‘ 0.11505 
Todide of sodium, . é ‘ : : 0.55016 
Oxygen, ‘ : : : 3 . 0.23547 
Water, . ‘ 0.09932 
There are three feveniedlages of shieiao one elon another red, 
and the third orange. ‘These three salts are insoluble in water, but 
soluble in nitric acid ; in evaporating this solution at a low tempera- 
ture, the yellow crystals are separated, whereas, when the evapora- 
tion is conducted at a high temperature, it yields the crystals of the 
neutral salt. 
The yellow salt is composed of: 
Silver, . ‘ ; j ; A : 0.48981 
Iodine, . .. , g ; ; : 0.28598 
Oxygen, =. 5 : : ; ; 0.16307 
Water, . g Se : é i 0.06114 
