202 EDWARD DIVERS AND TAMEMASA HAGA ; 



precipitate is nearly insoluble. It is a slightly basic* strontium salt, 

 with about 5 mois, water. The calculation given is for normal 

 strontium iunidosulphonate with 5 mois, water. 



An opaque, powdery salt is also precipitated when the mixed 

 solutions of strontium chloride and normal ammonium imidosulpho- 

 nate are boiled. It contains a very little ammonia and is no doubt a 

 slightly basic ammoniacal strontium salt. We have not quantitatively 

 analysed it. 



We have not attempted to prepare the two-thirds normal 

 strontium salt, though it could no doubt be easily got, like the calcium 

 salt (p. 204). Berglund prepared a solution of it, but found the salt 

 so soluble and so difficult to crystallise that he did not work further 

 upon it. 



Strontium sodium imidosulphonate is obtained when solutions of 

 normal sodium imidosulphonate and strontium chloride are mixed. 

 Probably, the proportions taken matter little. We have used 2 mois, 

 of the imidosulphonate to 3 mois, of the strontium salt in moderately 

 concentrated solutions. When mixed, precipitation occurs but the 

 precipitate redissolves on shaking and soon small prisms of the 

 strontium sodium salt separate. The salt is sparingly soluble and 

 resembles the calcium sodium salt, described in our first paper. Like 

 that salt, too, it contains 3 mois, of water, ils formula being 

 SrNaKTS.0., 3ILO. 



* We have got results indicating the existence of a hemihydroxy salt, (HOSr) s \S„O ß , cor- 

 responding with the lead salt, but have not had time to establish the fact. 



