796 Transactions. 
By considering the a of the neutral salts in the solutions the 
following equation is obtained :— 
x? (1— i Dee + 4ab) — ab? — 0. + 
a — total concentration of calcium ions; b = опро concentration of 
alkali salt; 2 = concentration of alkali UTOR form 
From this equation the following results may be UNE — 
i.) The concentration of calcium as carbonate in the solution is nearly 
eae being that of the carbonate in pure water 
he concentration of alkali carbonate is proportional to the con- 
каш of the added salt. 
(iii.) The value of the ratio 
"D , Where M,CO, is the alkali 
carbonate, for a given dilution is independent of the pa. e The values 
for a series of dilutions lie on a straight line in each c 
As an example, some of ие results obtained with Баа bromide may 
be quoted :— 
| CaCO, 
Concentration. CaCO, x 105, NaCO; x 105. NaCO; 
M/50 15-7 24-5 0-6 
M/100 13-5 12-4 17 
M/200 . 14-7 5-8 29 
400 14-2 2-9 78 
M/500 13-8 2-3 e 
M/1000 1155 1-05 110 
ч following conclusions were drawn from the work done 
. The solubility of calcium carbonate (calcite form) in gn bree ware 
at age C. in a closed vessel is 13- `4 X 10-5 grm. mols. per dele m mean 
value in у distilled water is 19-6 x 10-5 grm. mols, per litr 
2. The presence of traces of carbon dioxide exerts a ааай influ- 
ence on the solubilit 
e degree of hydrolysis of calcium carbonate may be calculated by 
electrometric means, Similarly, the value of the solubility product may 
be calculated. 
4. The addition of known quantities of neutral salts increases the 
solubility, but not regularly. 
t is doubtful if this exists a minimum concentration of the 
carbonate in presence of sodium chloride except in presence of small 
quantities of carbon dioxide. 
LITERATURE CITED. z 
A. Rows, Trans. N.Z. Inst., vol. 52, p. 192, 1920. 
F. Horr LLEMAN, Zeit, 4e Chem., vol. 12, р. 185, 1893. 
.M vol. 23, pp. 958-76, 1921. 
» pp. 305-7, 1915. 
E 
EE 
= 
s 
McCoy and H. J. Surrg TH, J. Am. C.S., vol. 33, p. 473, 1911. 
OHLRAUSCH, Zeit. physik. Chem., vol. 54, p. 236, 
; SOHNSTON and D. WILLIAMSON, JA Am. C.S., vol. 38, р. 975 et seg., 1916. 
SOLAS Oe фо м 
—— SSS е. 
E. 
А. 
J 
F. 
с È SEYLER and P. V. LLOYD, J.C.8., Trans., vol. 111, p. 996, 1917. 
F 
J. 
С. 
J. 
RÀ MÀ — — — 
J. J. Fox, B. A. Rep., p. 457, 
- KENDALL, J. Am. O.S., vol. A 1480, 1916. 
Lem 
