Ionization of Hydrofluoric Acid at 25 °C*
نویسنده
چکیده
The io niza tion constant, K" fo r the reaction HF:;:2 H + + F was ca lc ul ated on the ba s is of pote ntio· metric measure me nt s in the cell Ag; AgCl , CI , F II La F"II Na F, HCI, 1-1 , 0 1 KCI(Sa td .), I-I g,Cl 2 ; Hg at 25 °C. A leas t squ a res procedure was a ppli ed to the ex pe rime nt a l da ta yie lding a bes t es tim a te fo r K, of 5 .85 X 10 4 with a s tanda rd e rror of 0.03 X 10-" .
منابع مشابه
Influence of Grit-Blasting and Hydrofluoric Acid Etching Treatment on Surface Characteristics and Biofilm Formation on Zirconia
The objective of this study was to investigate the effect of hydrofluoric acid etching treatment on the surface characteristics of zirconia and Streptococcus sanguinis (S. sanguinis) and Porphyromonas gingivalis (P. gingivalis) biofilm formation on zirconia. Zirconia specimens were prepared with different treatments, including being polished with 1000-grit SiC abrasive paper as the control grou...
متن کاملEffect of hydrofluoric acid concentration and etching time on microtensile bond strength of suprinity and enamic CAD/CAM ceramics to resin cement
Introduction: The use of dental ceramics has increased due to their beauty and biocompatibility. The aim of this study was to evaluate the effect of hydrofluoric acid concentration and etching time on microtensile bond strength (μTBS) of the Enamic and Suprinity ceramics. Material & Methods: In this in vitro study, two hydrofluoric acid (HFA) concentrations of 5% (A) and 10% (B) were used at t...
متن کاملChemically etched open tubular and monolithic emitters for nanoelectrospray ionization mass spectrometry.
We have developed a new procedure for fabricating fused-silica emitters for electrospray ionization-mass spectrometry (ESI-MS) in which the end of a bare fused-silica capillary is immersed into aqueous hydrofluoric acid, and water is pumped through the capillary to prevent etching of the interior. Surface tension causes the etchant to climb the capillary exterior, and the etch rate in the resul...
متن کاملتاثیر اسید هیدروفلوریک تجربی بر استحکام باند و ریزنشت کامپوزیت به پرسلن
Background and Aims: The aim of this study was to evaluate the quality of an experimental hydrofluoric acid (HF) for preparation of porcelain and to compare it with two commercial hydrofluoric acids in Iranian trademark. Materials and Methods: A- Evaluation of etch pattern of experimental HF using scanning electron microscope (SEM): 6 feldespathic discs were divided into 3 groups. Each group w...
متن کاملComparative evaluation of niobium surface preparation methods for electrodeposition
To find a suitable treatment in the preparation of Nb surface for platinum electrodeposition, different methods such as thermal oxidation, anodic oxidation, mechanical roughening, and mechanical roughening with subsequent anodic etching were examined. X-ray photoelectron spectroscopy was used to study the chemical composition of depth analysis of the surface. Moreover, in order to examine the m...
متن کامل