scholarly journals Paired electrolysis for simultaneous electrochemical water softening and production of weak acid solutions

2019 ◽  
Vol 101 ◽  
pp. 88-92 ◽  
Author(s):  
Ignacio Sanjuán ◽  
Vicente García-García ◽  
Eduardo Expósito ◽  
Vicente Montiel
Keyword(s):  
Weak Acid ◽  
Acid Solutions ◽  
Water Softening

scholarly journals SOME PHYSICOCHEMICAL PROPERTIES OF DISSOCIATED SPONGE CELLS

1926 ◽  
Vol 10 (2) ◽  
pp. 239-255 ◽  
Author(s):  
P. S. Galtsoff ◽  
Vladimir Pertzoff
Keyword(s):  
Physicochemical Properties ◽  
Weak Acid ◽  
Hydrogen Ion ◽  
Acid Solutions ◽  
Average Value ◽  
Cliona Celata ◽  
Number Of Cells

1. The activity of the hydrogen ion, in a system containing 0.00280 mols of NaAc, 0.520 mols of NaCl per liter, and varied amounts of HCl or NaOH has been investigated. The average value of pK' for acetic add in this system is about 4.37. 2. The effect of the addition of various amounts of HCl and NaOH to a system containing 0.00280 mols of NaAc, 0.520 mols of NaCl, and a known number of cells of either Microciona prolifera or Cliona celata was then studied. It was found that in weak acid solutions Microciona behaves as a stronger base than Cliona, the former being practically saturated with base at a pH of 7.5. Similar behavior is shown by suspensions of cells to which no acid or base was added: the cells of Cliona are more acidic than the cells of Microciona. 3. The microscopic examinations of the cells subjected to the treatment with acid or base indicate that the cells of Microciona remain alive down to pH 4.50; the cells of Cliona sustain greater acidity,— a,t pH 3.7 they exhibit no signs of cytolysis. Tests for aggregation of these cells showed that this phenomenon is greatly inhibited even by slightly acid solutions. 4. The conclusion is drawn that the concentration of cells being equal, the suspensions of cells of Microciona and Cliona differ from each other in their physicochemical properties, the comparison being made on suspensions of specified composition.

THE RATE OF DECOMPOSITION OF CREATINE IN ACID AND IN ALKALINE SOLUTION

1933 ◽  
Vol 9 (4) ◽  
pp. 360-372 ◽  
Author(s):  
Jean Stirton Guthrie ◽  
Alexander Thomas Cameron
Keyword(s):  
Hydrochloric Acid ◽  
Alkaline Solution ◽  
Weak Acid ◽  
Alkaline Solutions ◽  
Acid Solutions ◽  
Secondary Maximum ◽  
Moderate Agreement ◽  
Minimal Rate

Studies have been made on the decomposition of creatine in acid and alkaline solutions at 37.5° and 50 °C. The rates of transformation to creatinine in acid solutions gave values for the Arrhenius constant varying from 20,700 to 24,000, values in moderate agreement with those of Edgar and Wakefield.There was a definite minimal rate of transformation at approximately 0.1 N hydrochloric acid, and a secondary maximum at about 0.01 N hydrochloric acid. This was probably owing to catalysis of creatine hydrochloride and free creatine at different rates. The slightly differing values found for the Arrhenius constant in strong and in weak acid solutions may be explicable on this basis.The results with alkali support Gaebler's views that creatine is initially transformed into urea and sarcosine, which then reunite to form ammonia and methyl hydantoic acid.These results show further that in solutions of acid and alkali of corresponding strength, alkali catalyses the change from creatine to creatinine much more rapidly than acid.

Conductance and Conductometric Titrations of Picric Acid in Sulfolane at 30°

1973 ◽  
Vol 51 (3) ◽  
pp. 448-450 ◽  
Author(s):  
P. M. P. Eller ◽  
Joseph A. Caruso
Keyword(s):  
Picric Acid ◽  
Weak Acid ◽  
Aprotic Solvents ◽  
Acid Solutions ◽  
Complex Solution ◽  
Solution Equilibria ◽  
Equivalent Conductance ◽  
Effect Of Water

Conductance of picric acid solutions in sulfolane resembles the behavior seen in several other aprotic solvents and is suggestive of complex solution equilibria. The effect of water on equivalent conductance of picric acid is large for concentrations greater than about 0.3 M. Picric acid behaves as a weak acid in conductometric titrations.

Sign in / Sign up

Export Citation Format

Share Document