g4 E. DIVERS AND T. HAGA. 



dipotassium oximidosulphoiiate, which exchanges one-third of its 

 hydrogen for sodium on treatnient with either sodium hydroxide, or 

 sodium carbonate, or sodium chloride witli ammonia. 



In working with sodium hydroxide some small excess of this 

 may be used without affecting the composition of the crystals. 

 Analysis (j() was made upon crystals prepared by adding NaOH to 

 2K2HNS0O7, that is, in the proportion calculated for the five-sixths 

 normal salt. 



The dipotassium salt dissolved in an excess of warm solution of 

 sodium carbonate, gave on cooling the crystals of Avhich (J)) is the 

 analysis. 



Analysis (c) is of crystals obtained by dissolving together in 

 warm water, XaCl + l^KjHXSoO^, and then adding concentrated am- 

 monia-water in moderate (piantity, and leaving to cool. The sodium 

 chloride was, it will be seen, taken in small excess, namely, in the 

 quantity calculated to produce the five-sixths normal salt. When the 

 effect of a great excess of sodium chloride Avas tried, the result was 

 less satisfactory, the crystals being then somewhat opaque jind less 

 definite in composition. As best prepared, this stilt made by the use 

 of sodium chloride, is somewhat less basic than a seven-ninths normal 

 salt, being half-way, in composition, between this and a three-fourth a 

 normal salt, 



Calc. Found. 



(a) {b) (c) 



Potassium 27-10 27-01 27.22 26*73 



Sodium 2-66 2-53 2-50 2'62 



Sulphur 22-18 22-00 22-08 22-27 



Twj-thinh normal potassium- sodium salt, KXallNSoO;, SHjO. — 

 This salt, but slightly more basic from the presence of about -zV! of an 

 atom of potassium in excess of that in the formula and being therefore 



