310 Dr. Hagen on Malic Acid, and the Changes 



Calculated. Found. 



1 eq. Malic acid 1461*39 47*09 



2 ... Magnesia. . 516*70 16*66 16*713 

 10 ... Water. . . 1124*8 36*55 



3102-89 



Of the salt dried at 100° C, 0*4-66 gave 0*109 sulphate of 

 magnesia, equivalent to 23*390° per cent, magnesia. 



Calculated. Found. 



1 at. Malic acid 1461*39 66*34 



2 ... Magnesia. 516*70 23*45 23*39 

 2 ... Water . . 224*96 10*21 



2203*05 

 This salt was also analysed by Professor Liebig with the 

 same result. 



b. Neutral anhydrous Malate of Magnesia. M 2 Mg O. 



This salt is obtained by precipitating a saturated solution 

 of the former salt [a.) with alcohol, and drying at 100° C. 



0*344 salt gave 0*0935 magnesia, equivalent to 26*945 per 

 cent.; atomic weight, 1906*88. 



Calculated. Found. 



1 atom Malic acid 1461*39 73*83 



2 atoms Magnesia 516*70 26*12 26*94 



1978*09 



Acid Malate of Magnesia. M Mg O H 2 + 3 aq 



M MgOH 2 0+ aq(100°). 



Obtained by dividing and saturating one half of the malic 

 acid with carbonate of magnesia, and evaporating to crystal- 

 lization. It loses 2 atoms of water by 100° C. ; at a higher 

 temperature it melts. 



1*1755 salt gave 0'1405 magnesia, equivalent to 11*952 

 per cent.; and for the atomic weight, 2161*5. 



Calculated. Found. 

 1 atom Malic acid 1461*39 67*35 



1 ... Magnesia 258*35 11*91 11*952 



4 atoms Water ... 449*91 20*74 



2169*66 



Of the salt dried at 100° C, 0*698 gave 0*0795 magnesia, 

 or 13*294 per cent.; atomic weight, 1943*0. 



