Sulfuric acid aqueous solution

Zinc electrowinning Zinc in a sulfuric acid/ aqueous solution, lead-silver alloy anodes, aluminum cathodes, barium carbonate, or strontium, colloidal additives... 

Reverse microemulsions were prepared by dissolving 8.9 g of AOT in n-heptane (200 mL) and adding precisely defined volumes of water or of a 0.5 M sulfuric acid aqueous solution to this mixture in order to have the desired water-to-surfactant molar ratio. 

In aqueous solution, it is converted to only a small extent to sulfurous acid aqueous solutions of H2SO3 contain significant amounts of dissolved SO2 (see equations 6.18-6.20). Sulfur dioxide is a weak reducing agent in acidic solution, and a slightly stronger one in basic media (equations 15.86 and 15.87). 

Total carbonyl groups in the polymer chain were determined by the method of Imai and Kazusa (22) using 2,4-dinitrophenylhydrazine. The ketone associated with double bonds, -C(0)-(C=C)2-, was measured by UV spectra at Amax — 270 nm with = 2.7 X 103M 1 cm"1 (23). /3-Hydroxyketones, peroxides, and 1,2-glycols and a-hydroxyketones were decomposed respectively with dilute alkali (reverse aldol reaction), potassium iodide in sulfuric acid aqueous solution, and periodic acid in sulfuric acid aqueous solution and then measured by GLC. 

Anodic porous alumina is conventionally grown on aluminum foils, as indicated in Fig. 2. Similar self-assembled growth is achieved on Si by depositing an A1 thin film on the front side of a silicon wafer and forming an ohmic contact on the back side that is used as anode. The electrochemical solutions currently used are oxalic or sulfuric acid aqueous solutions. Details for the fabrication of thin alumina templates on Si with adjustable pore size and density are given elsewhere [8]. Electrochemical oxidation of A1 starts from the A1 surface and continues down to the Al/Si interface, following an anodization current density/time curve as shown in Fig. 3. 

A basic study of the chemical composition and structure of two soapstone samples to improve scientific knowledge of this marvelous mineral is reported here. An investigation about the effects of a sulfuric acid aqueous solution on the physical integrity of the stone is also performed to provide some clues as to the main causes of corrosion (acid rain), and so to the possible approach to avoiding it. Since the acid attack begins at the surface, it is the surface chemical composition and structure that controls the acid corrosion. 

TABLE 2.1 Effect of Reaction Temperature on the Molecular Weight Distribution of Polyaniline Synthesized in Concentrated Sulfuric Acid Aqueous Solutions... 

The chemical system used for our study is a chlorite-iodide-malonic acid (CIMA) reaction in an acidic (sulfuric acid) aqueous solution. The CIMA reaction exhibits a rich variety of phenomena oscillations in a batch reactor or in a CSTR [26], transient target waves in a closed Petri dish [26], bistability in a CSTR [26, 27], front structures in a Couette reactor [27-30], and Turing patterns in open gel reactors [7-10]. In our two-side-fed reactor. Figure lb, components of the reaction are distributed in the two compartments in such a way that neither compartment is separately reactive. Chlorite is only in compartment A , and malonic acid is only in compartment B thus there are opposing chemical concentration gradients in the direction normal to the plane of the gel. The other chemical species are contained in equal amounts in both reservoirs, except for sulfuric acid, which is more concentrated in compartment B than in compartment A. Note that chlorite and iodide in compartment A are at a low acid concentration they would react rapidly at high acid conditions. 

The former concept of polymer lithium-ion batteries is not appropriate, since the traditional separators such as polypropylene and polyethylene are also polymers. When polyvinylidene fluoride and other polymers are used, the organic electrolyte is entrapped in the porous structure to form a gel. Similar to lead acid rechargeable batteries, a gel battery is produced by fixing the sulfuric acid aqueous solution in the form of a gel. To avoid confusing the consumers, the concept "gel lithium-ion battery (GOB)" is used here instead of "polymer lithium-ion battery."... 

Methyl Sulfuric Acid aqueous solution or liquid 52 8 " "... 

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