250 Phelps and Tillotson, Jr. — Malonic Acid. 



described for the recovery of malonic ester. Upon acidify- 

 ing this sodium carbonate solution with hydrochloric acid 

 and treating in the extractor as outlined above, 0*30 grm. of 

 malonic acid equivalent to 0*39 grm. of ester was obtained. 



In calculating the figures given in the last column that 

 stand for the per cent of malonic acid, or ester, unaccounted 



Table II. 



Malonic acid 



^ __ 



Malonic ester Found in Not 



Malonic , A v wash accounted 



No. acid Alcohol H 2 S0 4 Time Theory Found Per cent water for 



grm. cm 3 . grm. hr. min. grm. grm. grm. percent 



A 

 40 2-00 

 1 50 160 ... 1-15 76*92 70*96 92*30 



B 

 100 0*15 1-00 



1 50 200 .__ 1-00 76-92 67*62 87*90 1*66 7*8 



60 0*15 1-00 



2 50 140 1-85 1-00 76*92 70*00 91*00 1*04 5*8 



100 0'15 1-00 



3 50 200 1-85 0-45 76*92 70*84 92*09 1*05 4*8 



100 0*15 1-00 



4 50 200 1*85 1-00 76*92 71'50 92*95 



100 0*15 1-00 



5 50 200 1*85 2-00 76*92 73*12 95*06 0*36 3*2 



100 0*15 1-00 



6 50 300 1*85 2-35 76*92 72*60 94*38 0*37 3*9 



100 0*15 1-00 



7 50 200 4*85 1-00 76*92 70*93 92*21 1*80 3*2 



C 

 100 0*15 3-00 

 100 .__ 4-00 

 50 1*85 



1 50 200 ... 2-00 76*92 73*67 95*77 0*39 2*4 



100 2*00 4-00 



100 ... 4-00 



50 ... 



2 50 200 ... 2-00 76*92 73*94 96*11 0*40 2*1 



for, it was considered fair to add to the amount of malonic 

 ester obtained in a single experiment 1*25 grm., the amount 

 found by the blank test to be the loss inherent in the process 

 of recovery of the pure ester. To this sum was added the 

 amount of ester equivalent to the difference between the 

 malonic acid obtained from the sodium carbonate wash waters 

 and 0*39 grm., which as has been shown is the fraction of the 



