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Tuesday, July 14, 2020 | History

2 edition of effect of anions on the rate of dissolution of ferric oxide in acid solutions ... found in the catalog.

effect of anions on the rate of dissolution of ferric oxide in acid solutions ...

John William Jordan

effect of anions on the rate of dissolution of ferric oxide in acid solutions ...

by John William Jordan

  • 265 Want to read
  • 16 Currently reading

Published in New York city .
Written in English

    Subjects:
  • Diffusion.,
  • Anions.,
  • Ferric oxide.

  • Edition Notes

    Statementby John William Jordan, B. A.
    Classifications
    LC ClassificationsQD501 .J757 1938
    The Physical Object
    Pagination29, [1] p., 1 l.
    Number of Pages29
    ID Numbers
    Open LibraryOL6386978M
    LC Control Number39012907
    OCLC/WorldCa6560841

    effect of adding an ammonium salt such as ammonium carbonate in solution was not clear. Yamasaki found that the rate of dissolution of copper was independent of the concentration of ammonium salt while Halpern observed that the dissolution rate was also first order with . Jun 01,  · In this work, the dissolution of iron from a kaolinitic mineral (Veracruz, México) is compared with that from an iron ore (Michoacán, México), a specular hematite (México), a magnetite (southeastern Utah, USA) and a hematite (from Arizona, USA), using sodium thiosulfate and citric acid, as the reducing and complexing agents, elizrosshubbell.com by: 1.

    Ferrous and ferric sulfate stock solutions (1 M; pH ) were filter sterilized and added to the separately heat-sterilized medium which had been adjusted to pH with sulfuric acid. Cultures were incubated either shaken ( rpm) or unshaken at 45°C. Cultures were swirled prior to removal of samples for iron analysis to ensure thorough elizrosshubbell.com by: 1 Basics of Corrosion Chemistry Norio Sato which will determine the metal dissolution rate [7]. It is worth noting that, in general, Lewis acidity of the metal surface may gradually turn from soft acid to hard acid. The anions of soft base adsorbed in the range of less positive potentials are then.

    Sediment from the Rømø aquifer was used for reductive dissolution experiments with ascorbic acid. The rate parameters describing the reactivity of iron oxides in the sediment are in the range k' = 7·10 -6 to 1·10 -3 s -1 and γ = 1 to These values are intermediate between a . The ferroaquapentacyanide ion, [Fe(CN)5H2O]-3, may form as an intermediate. This result has been observed with solutions of hydroferrocyanic acid, and with solutions of alkali metal ferrocyanides after acidification with mineral acids, ammonium chloride, or organic acids.


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Effect of anions on the rate of dissolution of ferric oxide in acid solutions .. by John William Jordan Download PDF EPUB FB2

This behaviour is noted when using HNO3. Before discussing the effect of the various anions on the dissolution of A1 in acid solutions, the conditions prevailing at the metal surface are first outlined.

It is well agreed upon that A1 is always covered by an oxide film ca. h thick [20].Cited by: 8. The oxidative dissolution of FeS at 30 °C in aerated aqueous solutions in the pH range in the presence of inorganic anions (NO3 − and Cl −) was investigated by a potentiodynamic polarization elizrosshubbell.com corrosion current I corr increased with increasing [NO 3 −] and [Cl −], demonstrating the ionic nature of activated complex of FeS oxidative elizrosshubbell.com by: 2.

Vol. 29, No. 4, Acid dissolution of iron oxides and oxyhydroxides The experiments were carded out with either HCI or HCIO4. In most experiments M acid was used, but in some the acid concentration ranged from to M. The effect of ionic strength on dissolution rate was.

Effect of potential and ferric ions on lead sulfide dissolution in nitric acid Article in Hydrometallurgy 63(2) · February with Reads How we measure 'reads'. In most soils, FeIII oxides (group name) are the common source of Fe for plant nutrition. Since this Fe has to be supplied via solution, the solubility and the dissolution rate of the Fe oxides are essential for the Fe supply.

Hydrolysis constants and solubility products (Ksp) describing the effect of pH on FeIII ion concentration in solution are available for the well-known Fe oxides Cited by: Mechanisms of dissolution of iron oxides in aqueous oxalic acid solutions Article (PDF Available) in Hydrometallurgy 42(2) · September with 6, Reads How we measure 'reads'.

On the other hand, dissolution rates of goethites decrease as their Al substitution increases. Much less information exists on the rate of reductive and chelative dissolution of Fe oxides which generally simulate soil conditions better than dissolution by protonation.

Here again, type of oxide, crystal size and substitution are important elizrosshubbell.com by: Jun 26,  · A new approach is presented to an empirical modeling of chemical pickling processes, based on the activation energy of oxide dissolution in hydrochloric acid (HCl) and sulfuric acid (H 2 SO 4).The model allows us to calculate pickling times as a function of definite elizrosshubbell.com by: 4.

Feb 01,  · The effect of the concentration of nitrite ions, potential, pH and solution stirring on the dissolution rate of iron was studied. Nitrite ions were shown to accelerate active dissolution. The accelerating action of the oxidant depends on the ratio of the rates of electroreduction at the electrode surface and homogenous chemical reduction in the Cited by: 2.

higher the higher Ksp of the Felli oxide and thus also varies with the type of Fe oxide present. Besides the solubility, it is the dissolution rate which governs the supply of soluble Fe to the plant roots. Dissolution of Fe oxides takes place either by protonation, complexation or, most important, by reduction.

Iron oxide-hydroxide is also used in aquarium water treatment as a phosphate binder. Iron oxide-hydroxide nanoparticles have been studied as possible adsorbents for lead removal from aquatic media.

Production. Iron(III) oxyhydroxide precipitates from solutions of iron(III) salts at pH between and Appearance: Vivid, dark orange, opaque crystals. Kinetics of Manganese Oxides Dissolution in Sulphuric Acid Solutions Containing Oxalic Acid.

with sulphuric acid solutions and the effect of oxalic acid on this process are studied. As the sulphuric acid concentration is increased from to 5 N, the dissolution rate of. Iron (III) oxide is insoluble in water. If you add an acid (e.g. $\ce{HCl}$) it might react with the oxide and form a soluble iron salt.

How much of the oxide gets dissolved depends, amongst others, on what acid is used, its concentration and amount, and the time of reaction. whereas ascorbic acid-oxalate treatment could extract % and 67% of Fe from a Hapludult and a Rhodudult respectively, the corresponding figures for DCB extraction were 83% and %.

Rueda et al. () also reported that EDTA is a better complexant than. Iron(III) chloride is the inorganic compound with the formula (Fe Cl 3).Also called ferric chloride, it is a common compound of iron in the +3 oxidation elizrosshubbell.com anhydrous compound is a crystalline solid with a melting point of °C.

The color depends on the viewing angle: by reflected light the crystals appear dark green, but by transmitted light they appear elizrosshubbell.comal formula: FeCl, 3. IRON OXIDE WEATHERING IN SULFURIC ACID: IMPLICATIONS FOR MARS. S.M. Arlauckas, J.A Approximately 30 mL of each of the prepared acid solutions were separated into the screw top beakers.

The beakers were designated A, B and C, in order of reached a steady state rate of dissolution. Percent of Solid Iron Removed Through Time: Experiment A. Abstract The dissolution of quartz in dilute aqueous solutions of organic acids at 25° and standard pressure was investigated by the batch dissolution method.

The bulk dissolution rate of quartz in 20 mmole/Kg citrate solutions at pH 7 was 8 to 10 times faster than that in pure water. tion, this effect has been considered in detail by only one previous investigation.

Fogler et al. (3) used a rotating disk to study the dissolution of sodium and potassium feld- spars in mixtures of HF and HC1. A rate law relating the kinetics of dissolution to the concentrations of HF and HC1 of the form.

@article{osti_, title = {Reduction of plutonium(VI) to plutonium(IV) in nitric acid by nitric oxide or nitrogen dioxide gases}, author = {Bennett, M R and Kelmers, A D}, abstractNote = {The reduction of plutonium(VI) to plutonium(IV) by NO or NO/sub 2/ gas was studied in 3 M HNO/sub 3/ at 26 to 80/sup 0/C.

Complete reduction to plutonium(IV) was achieved with either gas; however, the. current density increases the dissolution rate of iron electrode according to Faraday's law (Figure 3) The effect of hydrochloric acid and sulfuric acid concentration on current output of iron dissolution and the dissolution rate of the iron electrode during the polarization of electrodes by three-phase alternating current was elizrosshubbell.com: M T Sarbayeva, A B Bayeshev, G T Sarbayeva, K T Sarbayeva, A K Bayesheva, Zhurinov elizrosshubbell.com.

e. primary colloidal particles) and the size is controlled by the apparent solubility of the ferric hydroxide and the buffer effect of the sulfate on the coordination rate of hydroxyl ion for ferric iron. The effect of anions on the sedimentation volume of the aluminum precipitate may be explained in the same manner.Apr 13,  · Another potentially important factor that has not been previously considered in the dissolution of pure iron oxide phases in the atmosphere is the impact of acid type.

Under acidic conditions, the deliquescence layer on particle surfaces often contain high concentration of anions, i.e., sulfate, nitrate, and chloride (24, 25). Therefore, not Cited by: Jul 22,  · Iron has three oxides: FeO; Fe2O3; Fe3O4 FeO + H2SO4 >> FeSO4 + H2O Fe2O3 + 3H2SO4 >> Fe2(SO4)3 + 3H2O Fe3O4 + 4H2SO4 >> FeSO4 .