Solution, sulfuric acid density

If 125 mb of concentrated sulfuric acid solution (density 1.84 g/mb, 98.3% H2SO4 by mass) is diluted to a final volume of 3.01 b, calculate the following information. 

TABLE 5.5 Shrinkage of Sulfuric Acid Solution Density of Dilute Shrinkage of Mixed Density of Dilute Shrinkage of Mixed... 

Corrosion (spontaneous dissolution) of the catalyticaUy active material, and hence a decrease in the quantity present. Experience shows that contrary to widespread belief, marked corrosion occurs even with the platinum metals. For smooth platinum in sulfuric acid solutions at potentials of 0.9 to 1.0 V (RHE), the steady rate of self-dissolution corresponds to a current density of about 10 A/cm. Also, because of enhanced dissolution of ruthenium from the surface layer of platinum-ruthenium catalysts, their exceptional properties are gradually lost, and they are converted to ordinary, less active platinum catalysts. 

In the tube T, place a solution of potassium hydrogen sulfate saturated at about 0° or made by saturating a solution of sulfuric acid of density 1.3 with normal potassium sulfate, K2S04. Fill the beaker B with ice and water. Use three storage cells and secure a voltage across the terminals of about 6.75 volts and a current density of 1 amp. per square centimeter. 

Oxidation of Methane. A variety of new catalyst systems have been disclosed, and new reagents were developed with the aim to perform selective transformation of methane to methanol, methyl esters, and formaldehyde. Much work was carried out in strongly acidic solutions, which enhances the electrofilicity of the metal ion catalyst, and the ester formed is prevented from further oxidation. An important advance in the selective oxidation of methane to methanol is Periana s 70% one-pass yield with high selectivity in sulfuric acid solution under moderate conditions.1073 The most effective catalyst is a Pt-bipyrimidine complex. Pt(II) was shown to be the most active oxidation state generating a Pt-methyl intermediate that is oxidized to yield the product methyl ester. A density functional study... 

The density of a sulfuric acid solution is 1.540 g/ml. How much does 1 liter of this solution weigh ... 

Calculate the (a) molar concentration and (b) molality of a sulfuric acid solution of density 1.198 g/mL containing 27.0% H2SO4 by weight. 

Fig. 9.5 Persulfate concentration vs. treatment time of two solution containing initially sulfuric acid solutions with and without salicylic acid. Initial sulfuric acid concentration 1 mol dm-3, initial salicylic acid concentration 3.6mmol dm-3, temperature 70°C, and applied current density 15.8 mA cm-2...

The S04 ions and the ions in these equations are in the concentrated sulfuric acid solution. As the discharge reaction proceeds, sulfuric acid (2 S04 + 4H ) is used up and water is produced. The solution becomes diluted, and the state of the charge of the cell can be measured by measuring the density of the solution. (If the battery is not permanently sealed, a mechanic at a gas station can check the charge.)... 

What mass in grams is present in 45.0 mL of sulfuric acid solution, which has a density of 1.86 g/mL ... 

Electrolysis yields only low amounts of ozone, 4 to 7 grams per kilowatt-hour, because the high current densities needed at the anode cause heavy losses of ozone by thermal destruction. Here, too, the yields can be improved by lowering the temperature. Thus, using sufficiently concentrated sulfuric acid solutions, it is possible to electrolyze at temperatures slightly above the eutectic point (—75° C.) of the sulfuric acid-water system, and so obtain yields close to 12 grams per kilowatt-hour (I, 6). 

What are the molarity and normality of a sulfuric acid solution that is 19.6% H2SO4 by mass The density of the solution is 1.14 g/mL. 

The density of a sulfuric acid solution taken from a car battery is 1.225 g/cm This corresponds to a 3.75 Msolution. Express the concentration of this solution in terms... 

In a subsequent paper, electrodeposition of rhenium species from sulfuric acid solutions of perhhenic acid onto polycrystalline Pt and Au surfaces was carried out both in underpotential and overpotential regimes. Metallic Re could be obtained by applying relatively high cathodic current densities, whereas Re(IV) compounds were more likely to form in reduction of ReO4 at low current densities. Lastly, the deposition of rhenium species on Au from Re2O7 containing sulfuric acid solutions was studied. It was shown that the chemical nature of electrodeposited rhenium... 

Electrolytic oxidation of anthracene in 20 per cent sulfuric acid solution with 1 per cent of vanadium pentoxide present is carried out at 80° C. with lead electrodes and a current density of 300 amperes per square meter at 1.6 volts. Good yields have been claimed 10 for this process. Air under pressure has been used for the oxidation of anthracene in the form of dispersions in aqueous ferric sulfate solutions,20 or as a solution iu pyridine or dispersion in aqueous alkaline solutions preferably in the presence of catalysts 21 of copper, cobalt, nickel or lead compounds. Vanadium compounds have been found more active than chromium compounds for use as oxidation catalysts in the form of suspensions in the liquid phase, as in the preparation of aniline black.22 Anthracene suspended in water or dilute sulfuric arid or dissolved in a solvent as acetone is oxidized with ozone, or ozonized oxygen at ordinary temperatures.28... 

Sulfuric acid is a diprotic acid (see Table 15.5). It is a colorless, viscous liquid (m.p. 10.4°C). The concentrated sulfuric acid we use in the laboratory is 98 percent H2SO4 by mass (density 1.84 g/cm ), which corresponds to a concentration of 18 M. The oxidizing strength of sulfuric acid depends on its temperature and concentration. A cold, dilute sulfuric acid solution reacts with metals above hydrogen in the activity series (see Figure 4.15), thereby liberating molecular hydrogen in a displacement reaction ... 

Hydrogen peroxide is obtained by electrolytic processes that involve the formation of peroxodisulfate ion and its subsequent hydrolysis. Sulfuric acid or ammonium sulfate-sulfuric acid solutions are electrolyzed at high current density ( 1 amp/dm2) at electrodes (usually Pt) that have high... 

In order to evaluate the effectiveness of a-SiC as a protective layer on a triple-junction a-Si device, triple-junction a-Si devices, both with and without a-SiC deposited on the surface, were exposed to chemically aggressive basic (1 molar [M] potassium hydroxide [KOH]) and acidic (1 M sulfuric acid) solutions. Current density measurements showed that the a-SiC coating provided some protection in the basic solution, but in acid, no noticeable difference occurred between the protected and non-protected samples. This suggests that a-SiC may not be necessary to protect the device, especially when the electrolyte solution is acidic. 

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