Critical Evaluation of the Second Dissociation Constants for Aqueous Sulfuric Acid over a Wide Temperature Range

2013 ◽  
Vol 58 (11) ◽  
pp. 3009-3032 ◽  
Author(s):  
Hannu Sippola
Keyword(s):  
Sulfuric Acid ◽  
Wide Temperature Range ◽  
Dissociation Constants ◽  
Critical Evaluation ◽  
Temperature Range ◽  
Aqueous Sulfuric Acid

Thermodynamics of protonation of N,N-dimethylthioamides in aqueous sulfuric acid

1990 ◽  
Vol 68 (10) ◽  
pp. 1746-1749 ◽  
Author(s):  
Alessandro Bagno ◽  
Vlttorio Lucchini ◽  
Glanfranco Scorrano
Keyword(s):  
Sulfuric Acid ◽  
Temperature Range ◽  
Aqueous Sulfuric Acid ◽  
Solvation Thermodynamics ◽  
External Stabilization

The protonation (m* and [Formula: see text]) and thermodynamic (ΔG°, ΔH°, ΔS°) parameters of ionization of four thioamides RCSNMe2 (R = Me, Et, i-Pr, t-Bu) have been determined in aqueous sulfuric acid in the 25–60 °C temperature range with a UV technique. The title compounds are relatively strong bases; 100% protonation is reached in 47% H2SO4. Their solvation is lower than for primary thioamides and sulfides, as indicated by the higher values of m*, and close to the range of carbon bases. Base strengths are discussed in terms of the competition between internal and external stabilization. Keywords: basicity, protonation, solvation, thermodynamics, thioamides.

Thiohydantoins. VII. Ionization and ultraviolet spectra of 4-thiohydantoins and 2,4-dithiohydantoins

1969 ◽  
Vol 47 (7) ◽  
pp. 1117-1122 ◽  
Author(s):  
J. T. Edward ◽  
J. K. Liu
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Dissociation Constants ◽  
Acid Media ◽  
Ultraviolet Spectra ◽  
Aqueous Sulfuric Acid ◽  
Different Types ◽  
Acid And Base ◽  
Methyl Derivatives ◽  
Acidity Functions

The acid and base dissociation constants of 5,5-pentamethylene-4-thiohydantoin, 5,5-pentamethylene-2,4-dithiohydantoin, and their 1-methyl derivatives, have been determined by ultraviolet studies in basic and acid media. In aqueous sulfuric acid the 4-thiohydantoins are protonated on oxygen at the 2-position, so that the extent of protonation varies with the HA function of the acid solution, while the 2,4-dithiohydantoins are protonated on sulfur at the 2-position, so that the extent of their protonation varies with H0′′′. The importance of using acidity functions appropriate to the different types of compounds when comparing their basicities is emphasized.

scholarly journals 870 PB 200 INFLUENCE OF SCARIFICATION AND TEMPERATURE TREATMENTS ON SEED GERMINATION OF LUPINUS HAVARDII

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 558d-558
Author(s):  
Tim D. Davis ◽  
Wayne A. Mackay ◽  
Daksha Sankhla
Keyword(s):  
Sulfuric Acid ◽  
Seed Germination ◽  
Seed Coat ◽  
Wide Temperature Range ◽  
Cut Flower ◽  
Seedling Mortality ◽  
Razor Blade ◽  
Temperature Range ◽  
Big Bend ◽  
Concentrated Sulfuric Acid

Seeds of Lupinus havardii Wats. (Big Bend bluebonnet), a potential cut flower crop, were subjected to a variety of scarification and temperature treatments. Without scarification, only 10-20% of the seeds germinated within one week. Germination percentages increased sigmoidally as scarification time in concentrated sulfuric acid increased. Nearly 100% germination was obtained within one week after seeds were placed in sulfuric acid for 120 min. Nicking the seed coat with a razor blade also resulted in near 100% germination. Soaking the seed in water for 24 h failed to enhance germination. Soaking the seed in ethanol, methanol, or acetone for 2 h likewise failed to enhance germination. Total germination of scarified seed was >90% between 21 and 33C within 28 h. The most rapid germination occurred within a range of 24-29C. Above or below this range germination was delayed. At 35C, seedling, mortality was observed and total germination was reduced to <50%. Our data indicate that seed of this species requires scarification for optimum germination but the seed can germinate over a relatively wide temperature range.

Fibre-optic temperature sensor with wide temperature range characteristics

1987 ◽  
Vol 134 (5) ◽  
pp. 291 ◽  
Author(s):  
K.T.V. Grattan ◽  
J.D. Manwell ◽  
S.M.L. Sim ◽  
C.A. Willson
Keyword(s):  
Wide Temperature Range ◽  
Temperature Sensor ◽  
Fibre Optic ◽  
Temperature Range

Enabling highly reversible sodium metal cycling across a wide temperature range with dual-salt electrolytes

2021 ◽  
Author(s):  
Akila C. Thenuwara ◽  
Pralav P. Shetty ◽  
Neha Kondekar ◽  
Chuanlong Wang ◽  
Weiyang Li ◽  
...  
Keyword(s):  
Wide Temperature Range ◽  
High Energy ◽  
Liquid Electrolyte ◽  
Metal Cycling ◽  
Temperature Range ◽  
Sodium Metal ◽  
Wide Range

A new dual-salt liquid electrolyte is developed that enables the reversible operation of high-energy sodium-metal-based batteries over a wide range of temperatures down to −50 °C.

Magnetic anomalies, chemical and magnetic properties at wide temperature range (15–1000 K) in LiSrxFe5-xO8 (x = 0, 0.025, 0.05)

2021 ◽  
Vol 859 ◽  
pp. 158290
Author(s):  
S. Udhayakumar ◽  
G. Jagadish Kumar ◽  
E. Senthil Kumar ◽  
M. Navaneethan ◽  
K. Kamala Bharathi
Keyword(s):  
Magnetic Properties ◽  
Wide Temperature Range ◽  
Magnetic Anomalies ◽  
Temperature Range
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