A method for the determination of free caustic alkali in soap

1916 ◽  
Vol 181 (6) ◽  
pp. 872
Keyword(s):  
Caustic Alkali ◽  
Free Caustic Alkali

scholarly journals On a new method for the determination of atmospheric carbon dioxide, based on the rate of its absorption by a free surface of a solution of caustic alkali

1905 ◽  
Vol 76 (507) ◽  
pp. 112-117 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Free Surface ◽  
Partial Pressure ◽  
Atmospheric Carbon Dioxide ◽  
Liquid Surface ◽  
Caustic Alkali ◽  
Optimal Velocity ◽  
Rate Of Absorption ◽  
A Current

In an appendix to a paper on the static diffusion of gases, communicated to the Society in 1900, it was shown that when a current of air containing a constant proportion of carbon dioxide is caused to move in a turbulent stream over the free surface of a solution of caustic alkali, the rate of absorption of that gas increases with the velocity of the air-current up to a certain optimal speed, beyond which no further increase in the speed of the current influences the rate of absorption. It was further shown that when the optimal velocity of the air-current has been reached, and the temperature is maintained practically constant, the rate of absorption then varies directly as the partial pressure of the carbon dioxide in the air. In other words, if under the above conditions the rate of absorption per unit of area of the liquid surface is a for a partial pressure of carbon dioxide represented by and is for a partial pressure of p' , then at similar temperatures, a / p = a' / p' . A suggestion was also made that this principle might be found applicable to a determination of the carbon dioxide in air, and that if the method were found to be a practical one it would have the manifest advantage of not requiring any measurement of the air from which the gas was absorbed.

scholarly journals Publication announcement

1905 ◽  
Vol 76 (507) ◽  
pp. 87-87
Keyword(s):  
Carbon Dioxide ◽  
Free Surface ◽  
Special Reference ◽  
Atmospheric Carbon Dioxide ◽  
New Method ◽  
Caustic Alkali ◽  
Physiological Processes ◽  
Thermal Emissivity ◽  
In Series

Researches on some of the Physiological Processes of Green Leaves, with special Reference to the Interchange of Energy between the Leaf and its Surroundings. By HORACE T. BROWN, LL.D., F.R.S., and F. Escombe. On a New Method for the Determination of Atmospheric Carbon Dioxide. based on the Rate of its Absorption by a Free Surface of a Solution of Caustic Alkali. By HORACE T. BROWN, LL.D., F.R.S., and F. Escombe On the Variations in the Amount of Carbon Dioxide in the Air of Kew during the Years 1898-1901. By HORACE T. BROWN, LL.D., F.R.S., and F. EscOMBE. On the Thermal Emissivity of a Green Leaf in Still and Moving Air. By HORACE T. BROWN, LL.D., F.R.S., and W. E. WILSON, D.Sc., F.R.S. These papers, which formed the basis of the Bakerian Lecture, delivered by Dr. Horace T. Brown, on March 23, 1905, are published in Series B of 'Proceedings,' April, 1905.

scholarly journals Quality Analysis of Selected Toilet Soaps in Saudi Arabia Markets

2020 ◽  
pp. 7-14
Author(s):  
E. E. Shehata
Keyword(s):  
Saudi Arabia ◽  
Fatty Acid ◽  
Free Fatty Acid ◽  
Limited Range ◽  
Quality Analysis ◽  
Fatty Matter ◽  
Caustic Alkali ◽  
Ph Values ◽  
Free Caustic Alkali ◽  
Total Fatty Matter

Soap is sodium or potassium salt of fatty acid produced by saponification reaction. The physicochemical properties of soaps determine their quality and hence determine their efficiency. Four toilet soaps from local markets in Saudi Arabia were analyzed for moisture, pH, free caustic alkali or free fatty acid, total fatty matter and insoluble matter in alcohol. The percentage of the moisture ranged between (3.0534±0.1782 -5.1235±0.4891 %), total fatty matter (79.6907± 0.0534 - 94.8253 ± 0.0622), insoluble matter in alcohol (0.7939± 0.0134 - 1.0368± 0.0234% (and there is no excess free caustic alkali. However, the pH values between (8.715±0.0219 - 9.745±0.0212). This study showed that the percent of moisture, free caustic alkali, insoluble matter, total fatty matter and pH values for different samples found to be in limited range. Finally, the percentage of free fatty acid are (1.0433±0.0813 -1.4107±0.1731%). The soaps analyzed proved to be of high quality and meet the standard values.

scholarly journals Rapid determination of a trace of iron in caustic alkali by polarography

1959 ◽  
Vol 8 (11) ◽  
pp. 707-710
Author(s):  
Toshihide SAITO ◽  
Isao MURAKI
Keyword(s):  
Rapid Determination ◽  
Caustic Alkali

Importance of Acidic Components in Compounding Ammonia-Preserved Latex with Zinc Oxide

1943 ◽  
Vol 16 (2) ◽  
pp. 342-364
Author(s):  
W. G. Wren
Keyword(s):  
Zinc Oxide ◽  
Hydrochloric Acid ◽  
Experimental Work ◽  
Controlling Factor ◽  
Ammonium Salts ◽  
Caustic Alkali ◽  
Naturally Occurring ◽  
Acidic Components

Abstract In view of the experimental work described above, it appears that changes in viscosity of zinc oxide-compounded latex are due largely to the presence of ammonium salts of naturally occurring acids. These salts enable zinc to pass into solution, and to be absorbed by the latex globules, thus giving rise to the thickening commonly experienced. The amount of zinc passing into solution is directly proportional to the amount of acid present, and it is therefore suggested that determination of the acids by either of the methods described (viz., titration to pH 11 with caustic alkali, or from pH 7 to the end-point with hydrochloric acid), would form a sound basis for the classification of latices in regard to their behavior on compounding with zinc oxide. The investigations thus indicate that the variability of latex is due, in part at least, to the presence of acidic substances and may, therefore, be controlled by preventing the formation of the acids, or by their removal. Summary.—It is demonstrated that naturally occurring acidic substances control the solubility of zinc oxide in ammonia-preserved latex, and it is concluded that they are probably the controlling factor in determining the increase in viscosity which occurs in latex compounded with zinc oxide. In support of this view, it has been shown that the addition of various types of acid to ammonia-preserved latex markedly increases thickening after mixing with zinc oxide, and that the removal of naturally occurring acids reduces the thickening. It is suggested that titration of the acids in latex by the methods described forms a sound basis for the classification of latices in regard to their behavior on compounding with zinc oxide.

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