82 



E. DIVERS AND T. HAGA. 



precipitate of tili ïri salt, not quite pure however, but containing small 

 quantities of jtotassium, acetic acid, and lead in excess. Tlie corres- 

 ])ündin,u- sodium salt could no doubt be used in place of the potassium 

 snlt, but has not been tried. The precipitate is voluminous and 

 üoccident. Its formation is represented by the equation — 



K,HN.S,U, + iXPbOH)OAc=(HOPb)JiNS,0, + LnvOAc. 



Analysis of a preparation freest from potassium gave the follow- 

 inf'' results, which are compared "with the results of calculation for the 

 above formula with one-ninth of an atom of PbO additional : — 



Cale. Found. 



Lead (U-10 63-92 



Potassium — 0*23 



Sulphur 9-39 9-3(; 



The slight approach in composition to the normal hydroxy-lead salt, 

 which the small excess of lead indicates, is in agreement with what is 

 observed in preparing the dipotassium salt, which is apt to crystallise 

 with a little excess of potassium. Calculation for the pure salt gives 

 lead 63'01 and sulphur 9*74 per cent. 



(4) Flvc-!<ix(hs normal accio-lujilfoxij-lcad o.ciiiiidosuliiltoNale. 

 (Ä;:OPb)(HOPb),H(NSoO,),, 24-H,0.— When to two mois, of normal 

 sodium oximidosulphonate in somewhat concentrated solution excess — 

 say three to six mois. — of normal lead acetate is added, there form in 

 some hours or days hard, almost opaque, spherical granule.-, of radiat- 

 ing crystalline structure, some at the surface of the solution, others 

 adherent to the sides and bottom of the vessel. These granules are of 

 the required salt not quite pure however and incapable of being purified 

 because slowly decomposed l)y water. The preparati(3n of which the 

 analysis follows, contained, it will be seen, acetic acid in excess ofthat 

 indicated by the formula. It would be possible to include this extra 



