( -151 ) 



When cold, the filtered liquid was weighed and then titrated with 



1 1 



— — N and — - N sulphuric acid with phenolphtalein as indicator ; the 

 2,8 28 



neutralised liquid was then rinsed into a 50 cm. flask, diluted up 



to the mark and polarised. The "i-esidue", after weighing, was 



1 ^ 1 



titrated in the bottle itself with — — N and — N hydrochloric acid, 



0,28 2,8 



the neutral solution transferred to a 50 cc. flask, made up to the 

 mark and polarised. The amount of "residue" varied from 6 to 15 

 grams. As relatively strong hydrociiloric acid solutions were used in 

 the titration, the calcium chloride formed may influence the polarisa- 

 tion, and as sometimes only about 6 grams of "residue" (+ 74 

 normal weight of the polarimeter) were dissolved to 50 cc. and as, 

 therefore, the result of the polarisation had to be multiplied by about 

 two, the analysis of the "residue" was not so correct as that of 

 the liquid. As, however, the analysis of the deposit only served to 

 control the progressive chajige of the process it was sufficient for 

 our purpose. 



Of some series of determinations the first of which served for 

 orientation, we give the last series. A cold solution which contained 

 9.90 7o of sugar and 2.20 7o of CaO served as a start. The. results 

 are given in Table 2. In Fig. 2 the values obtained are given in 

 a graphic I'epresentation. 



TABLE 2. 



^) In N". 6 calcium hydroxide was added. The reason thereof is communicated 

 below. 



