416 Miscellaneous Intelligence. 



oncy'fbf'ttiis liurpose, the neutral or acid iodate of potash was dis- 

 solved and heated with that salt of potassato be associated with it, 

 the liquid being strongly acidified with the same acid as that con- 

 tained in the latteif salt.' No combinations were in this way ^td- 

 duced. " ■ • ''• '^'^-^'^'^^•"'•^^■- ■••.-■^ ..,...-,..,.,,,,.» 



•"But a sulphate arid iodate of potassa may be obtained by con- 

 centrating the mother-liquors of the process tor preparing tri-iodate 

 of potassa to a certain point ; very regular transparent crystals are 

 formed, which are a singular combination of bi-sulphate with bin- 

 iodate of potassa. When analyzed, it gave the elements of such a 

 combination. When dissolved in water and crystallized, it gaV-e 

 pure bin-iodate, find afterwards an acid sulphate of potassa. ''^li^^fn 

 Chlor iodate of Potassa. — The double compound formed by the 

 action of muriatic acid on the iodate of potassa is easily formed and 

 well characterised. The solution of chloride of iodine is to be im- 

 perfectly saturated with caustic or carbonated potassa, the solution 

 filtered and evaporated spontaneously ; if not too dilute, crystals soon 

 form, whicli are brilliant and transparent, and either long prisms or 

 hexagonal phites. When exposed to air they lose their transparency. 

 When dissolved, the solution is acid. 1 of the compound dissolves 

 in 18 or 20 of water, at the temperature of 59° F. Muriate and 

 iodate of potassa put together do not produce the compound, unless 

 there be excess of muriatic acid. When analyzed, the salt was found 

 constituted as follows : 



Chloride of potassium h qji \o^(\w 0.7806 ian'dt/q 



Bin-iodate of potassa . i^'-^fi? f-'^' • 4.0887 'S'bho 



^ nml^dm 



^Mm '^'"'^ 



^Iodate of Soda.- — Solution of chloride of iodine was imperfectly satu- 

 Irated with soda instead of potassa ; no precipitate or crystallization took 

 place : concentrated alcohol was poured in, an abundant precipitate 

 fell, which was separated on a cloth, washed with alcohol until neu- 

 tral, and pressed. The solid substance being dissolved in water, 

 filtered, and placed in a stove at 77° F. the liquid became acid, and 

 in 24 hours deposited large crystals of pure neutral iodate of soda. 

 They were right octoedral prisms, terminated by hexaedral pyramids; 

 they effloresced in the air. Further evaporation gave other crops of 

 crystals of this salt, and only a little chloride of sodium was'fewid 

 in the mother-liquor. — Annates de Chimie, xliii. 113. • >- ;? srii 



9. Detection of Barytk df StrontiA'Wfi)hi^f resist ihWi M«R«*- 

 The methods which have been proposed for this object are well 

 known to be imperfect. Mr. Andrews recommends the following as 

 the best, it being an extension of that proposed by Bucholz. Dis- 

 solve the carbonates of lime and baryta or strontia in nitric acid, 

 evaporate the solution to dryness, and decompose the nitrates by 

 heat. To the dry mass, add boiling water (pure in the case of 

 baryta, but saturated in the cold with sulphate of strontia in the 

 case of that earth,) and boil it for a few minutes, keeping the cru- 



