
1922.] Indian Science Congress. 1L.8.C. 67 
The equilibrium between a mixture of acetic acid and 
trichoracetic acid and their esters.—By D. D. Karve 
and J. J. SUDBOROUGH. 
The Equilibrium 
..C0,H+ +001 3.CO,Et > CH3.CO,Et +CCl;.CO,H. 
has ey _ d at 30°. 
At given intervene | of time three titrations were made, each with 1 
gram of gt ce ixture 
1. Free acid by pie with standard ammonium hydroxide using 
i ° 
2. Titration in the. cold with standard sodium hydroxide with 
henolphthalein as indicator. The difference between this and 
te. 
3. Bagi ies with sodium Pi leer aes and titration of 
of caustic soda with standard hydrochloric acid. 
The cifacaine pation, es total alkali required for saponifica- 
tion and that used under (2) gives the amount of ethyl 
ate in the mixture. 
The results show that equilbrium is attained only after some 170 
If equivalent quantities of ethyl acetate and raheagnotergs acid are 
il 
acetate to ethyl piprnsrkheo te is always ro any et 
he values of the reaction Weloatlion for aie chenanen 
CH;3.CO fcber CO,Et—»>CH3.CO,Et + CCl,CO,H 
CCl; +CO,H + CH,.CO,Et—»CCl;.CO,Bt + CHs CO,H 
have also been determined at 30°. 
Coagulation of manganese qosite sol by different elec- 
trol ea . GANGULY. 
sol of manganese dioxide was prepared being stabilised by me 
of sohatias oat the conguieting * otiecss of about thirty different elee- 
trolytes were investigated. The mum quantity of electrolyte neces 
brin i ti 
many of the ovalent ones. 
The effe te oF variate of concentration of the sol ata me toa cone 
and cur t 
of an electrolyte necessary for coagulation and the c seagate ions of the 
sol. It has been f i iz 
first increases and then decreases; in 0 aa soanes & 
quantity of the electrolyte first increases then tation of th. 06 
creases with the continual increase 0 of the concentra . on fe 
It remains constant in the case of lead nitrate and increases gr 
in the case of epomene chloride. 
viz. , eer nitrate the 
— 
Alcohol f the menthyl esters of some af-unsa- 
Ss ‘ eae and of their saturated analogues. —By B. 
Dasanwactians and J. J. SupBOROUGH. 
the rates 
The polarimetric method opted fo rmining id, 
of slcohotrabs of the menthyl coues of Reavis acid, erotonic act 
