Über die Dissoziation der Salpetersäure. I. Die Lösungsgeschwindigkeit des Kupfers in Salpetersäure

The oxidizing effect of nitric acid in aqueous solutions depends on the concentration of undissociated nitric acid. This makes the concentration of undissociated nitric acid an essential parameter to monitor and control the quality of silicon etching in the industrial manufacturing of solar cells. In the present study, a method known already is extended in such a way that the degree of dissociation of nitric acid can be determined by Raman spectroscopy in HF/HNO3/H2SiF6 acid mixtures over a broad concentration range for the first time and without using an internal or external standard to compensate the typical time‐dependent drift of a Raman spectrometer. The method developed requires the calculation of a peak area ratio from the areas of the unimpeded Raman signals assigned to nitrate (νN − O) at 1,048 cm−1 and to undissociated HNO3 (νN − OH) at 957 cm−1. The correlation between the peak ratio and the degree of dissociation of nitric acid revealed can be described by a simple empirical equation. Using this equation, the degree of dissociation of nitric acid can be determined over a broad concentration range in binary and ternary mixtures of HNO3 with HF and H2SiF6. The impact of the acids HF and H2SiF6 and the total water content in the degree of dissociation of nitric acid is discussed.

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Über die Lösung von Kupfer in Salpetersäure. II

Berg¹

1951

Zeitschrift anorg allge chemie

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Es wurde die Lösungsgeschwindigkeit v von Kupfer in Salpetersäure verschiedener Konzentrationen im Temperaturbereich ‐10° bis +30° gemessen. Die Meßwerte lassen sich durch die Gleichung darstellen. Darin bedeutet c(1‐α) die Konzentration der undissozierten HNO3‐Molekeln. Die Lösung des Kupfers geht über CuO nach der Formel HNO3 → O + HNO2. Bestimmend für die Lösungsgeschwindigkeit ist die Adsorption der HNO3‐Molekeln.

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Über die Dissoziation der Salpetersäure. I. Die Lösungsgeschwindigkeit des Kupfers in Salpetersäure

Cited by 19 publications

References 3 publications

Kinetics of the dissolution of uranium dioxide in nitric acid. II

Kinetics of the dissolution of uranium dioxide in nitric acid. II

Raman spectroscopic determination of the degree of dissociation of nitric acid in binary and ternary mixtures with HF and H₂SiF₆

Über die Lösung von Kupfer in Salpetersäure. II

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Über die Dissoziation der Salpetersäure. I. Die Lösungsgeschwindigkeit des Kupfers in Salpetersäure

Cited by 19 publications

References 3 publications

Kinetics of the dissolution of uranium dioxide in nitric acid. II

Kinetics of the dissolution of uranium dioxide in nitric acid. II

Raman spectroscopic determination of the degree of dissociation of nitric acid in binary and ternary mixtures with HF and H2SiF6

Über die Lösung von Kupfer in Salpetersäure. II

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Raman spectroscopic determination of the degree of dissociation of nitric acid in binary and ternary mixtures with HF and H₂SiF₆