76 



E. DIVERS AXD T. H AG A. 



(iLuiiitity lipon the normal potassiuni .salt otherwise found in the 

 mother-liquor, we may give the result of adding it in some excess to 

 a warm solution of the K^ salt. The precipitate obtained had a com- 

 position Avhich may Ije regarded as resulting from the addition of 

 harium hydroxide to the preceding salt, ov as that of a hydroxy- 

 derivative ofthat salt, in which half the Ijarium is as half-hydroxide. 

 The composition of the salt was (liO)3Ba8K.(NS207)5, 14H,0, Avhich 

 is nearly equivalent to (HO15a);i3a„K3(NS20,)r, lö^HoO, or aJ3a(0H), 

 4- Ba9K3(NlS2U7);. It is also related to Fremy's salt, Ijeing that salt 

 with Kg replaced ))y (H(Jl>:i);jBa : — 



Oalc. Found. 



Barium 45-r7 45-2i) 



Potassium .S-lU 3'21 



Sulphur 13'BS 13-11 



The reaction has been one in which potassium hydroxide is 



largely formed : — 



5KJl(XS,ü0.+ l(^Ba(Ull), = 2(llO)3lHK,(xVSA)o + 2lKOH + 5H,O 



The mother-li(|Uor was tested and found to contain much potassium 

 hydroxide and some barium hydroxide and nothing else. 



AVhen barium chloride in slight excess and in moderately dilute 

 solution is added to the K^ salt, it yields a similar compound lo that 

 obtained by excess of baryta- water, but with some chloride in place 

 of liydroxide of liarium. The precipitate had the composition 

 Cl(HO),Ba,,K3(XSoO,X, 7II3U or BaCL, + lM5a(011), + Ba3(XS,ü,X. + 

 2BaJs:3(NS,0-);-l- 14tL,0 (see lead salt 4, p. 82). 



Calc. Eoiiud. 



Barium 47-29 47-78 



Potassium o-87 o-24 



Sulphur 14-73 14-07 



Chlorine 1-02 0-96 



