OXIMIDOSULrHOXATES OR SÜLPHAZOTATES. 77 



Strontium oximidosjiJpliofiatefi. 



We have not made a a'eneral examination of the istrontium salts. 

 What we have observed <[iialitativelv and at variance with Fremy we 

 liave recorded on p. 4S. On adding warm concentrated strontia-water 

 to the five-sixths normal potassium salt the mixed solutions remain 

 clear for a few moments, but then become suddenly filled with fine 

 needles of very silky lustre. Yet this precipitate, which retains its 

 lustre when drv, has a com])Osition as complex as that of any barium 

 salt we have examined, the formula for it being (riO)3SriJvs(NSo07)j„ 

 I6H0O, which may be expressed more simply as (HOSr)3XSo07, 

 8(SrKXS,0;, 2H,.0), and in other ways :— 



-Calc. Found. 



Strontium i^S-9G 1\S-G9 



Potassiiun \)'oi) 9-3'J 



Sulphur 17'oo 17'41 



Mtroxy-rad., XO.. . . .S-12 S-lG 



Water 8-44 8-67 



Hydroxyl I'oo — 



A strontium sodium salt crystallises out in hemispherical tufts 

 of brilliant silkv needles, some hours after mixing either the disodium 

 sidt witli warm concentrated strontia-water, or the normal sodium salt 

 with strontium chloride. Xo analysis has been made of the salt. 



Ca lei um o.r im ii hmilp h on a tes. 



Calcium salts, including calcium hydroxide, are not precipitated 

 bv alkali oximidosulphonates. When solution of the nonnal or the 

 two-thirds normal ammonium salt is mixed with pure soft calcium 

 hydroxide, one w\o\. of the salt dissolves ab(^ut one mol. of the hydroxide, 

 this not havins' lieen added in excess, and ammonia is liberated. The 



