Ceric sulfate solution

All reaction mixtures contained 20.0 mL of oxygen-bubbled, irradiated dioxane, 0.5 g of lignin, and 0.15 mL of ceric sulfate solution. Reactions run in a Pyrex flask and contained 1,4-bdioxane irradiated for 3 h and 0.045 mol (3.2 g) of 2-propenamide. Determined in distilled water at 30°C. 

What is the molanty of a ceric sulfate solution if 46 35 ml is required for the titration of a 0 2351 g sample of Na2C204 that is 60% pure9 Thg reactjon is... 

Sonnenschein A 2% ceric sulfate solution in 20% aqueous trichloroacetic acid (that has been acidified with sulfuric acid) is sprayed on the plate. A variety of colors appear upon heating (110°C, 5 min). 

It is sometimes convenient to determine the reducing power of a carbohydrate by an indirect method. In this method, 43.2mg of the carbohydrate were oxidized by an excess of K FcfCNV,. The Fe(CN)g- formed in this reaction required 5.29 mL of 0.0345 N Ce(S04)2 for reoxidation to Fe(CN)g- (the normality of the ceric sulfate solution is given with respect to the reduction of Ce4+ to Ce3+). Determine the / cu-valiic for the sample. (Hint The number of meq Cu in a direct oxidation is the same as the number of meq Ce4+ in the indirect method.)... 

N Ceric Sulfate Solution Dissolve 3.3 g of ceric sulfate [Ce(S04)2] in 100 mL of water containing 3 mL of sulfuric acid. 

Ceric Sulfate, 0.01 N [3.322 g Ce(S04)2 per 1000 mL] Dissolve 4.2 g of ceric sulfate [Ce(S04)2-4H20] or 5.5 g of the acid sulfate [Ce(HS04)4] in about 500 mL of water containing 28 mL of sulfuric acid, and dilute to 1000 mL. Allow the solution to stand overnight, and filter. Standardize this solution daily as follows Weigh accurately about 275 mg of hydroquinone (CgHg02), dissolve it in sufficient 0.5 N Alcoholic Sulfuric Acid to make 500.0 mL, and mix. To 25.0 mL of this solution add 75 mL of 0.5 N sulfuric acid, 20 mL of water, and 2 drops of Diphenylamine TS. Titrate with the ceric sulfate solution at a rate of about 25 drops per 10 s until an endpoint is reached that persists for 10 s. Perform a blank determination using 100 mL of 0.5 N Alcoholic Sulfuric Acid, 20 mL of water, and 2 drops of Diphenylamine TS, and make any necessary correction. Calculate the normality of the ceric sulfate solution by the formula... 

It has been shown that Cu and Ag dissolve at essentially the same transport-controlled rate in acidified ceric sulfate solution (37). The authors postulate that the larger enthalpy of this reaction facilitates desorption of the product ions. The equilibrium adsorption of silver salts on silver is dependent on the anion and is much less than a monolayer at low concentrations (38). 

The peracetic acid content of the reagent may be determined by adding an aliquot to an equal volume of ice and water and titrating first with ceric sulfate solution until the orange color of the ceric ion remains (to eliminate hydrogen peroxide) and then adding potassiiun iodide and titrating with standard sodium thiosulfate solution. 

Let us assume that we want to measure the G-value, number of molecular changes per 100 e.v., of Ce4+ — Ce3+ in a ceric-sulfate solution as a function of the concentration. We measure the dose in a Fricke dosimeter vial or ferrous-cupric dosimeter vial at the same place as the vial containing the ceric solution, and then, as is usual, we correct for the difference in the energy transfer coefficient at 1.25 Mev. and for the difference in density of the solutions. However, as shown in Equation 14 and in Table V and Figures 3 and 4, these corrections are entirely inadequate because of the large difference in buildup factors. For 0.4M ceric sulfate solution, the correction caused by the buildup factor is 72% at fit r = 1 122% at /At r = 2 and 155% at fit r = 4. 

Since the addition of cerous ions to the ceric sulfate solution suppresses the effect of impurities, Matthews introduced the modified version of this dosimetry system by using a mixture of the ceric and cerous ions (Matthews 1982). Electrochemical potentiometry is applied to evaluate the irradiated solutions by measuring the redox potential difference between the unirradiated and irradiated solutions. This method can be applied in the dose ranges of 0.5-5 kGy or 5-50 kGy depending on the initial ceric ion concentration chosen. An important advantage of this method compared to spectrophotometry is that no dilution of the irradiated solution is needed. 

The method developed by Wang et al. (2008) was applied to the determination of ferulic acid in Taita Beauty Essence samples with satisfactory results. For the determination of ferulic acid a flow injection chemiluminescence method was developed based on the chemiluminescence reaction of ferulic acid with rhodamine 6G and ceric sulfate in sulfuric acid medium. When ferulic acid was injected into the acidic ceric sulfate solution... 

Solutions of ceric sulfate are remarkably stable. This assertion is in contradiction with the F/pH diagram. The explanation lies in the occurrence of a kinetic phenomenon. The kinetics of the reaction of water oxidization by ceric ion are complex. The formation of the species Ce(OH) + seems to prevent any fast kinetic. From another standpoint, another advantage is that ceric sulfate solutions do not need to be protected against light. 

The reaction is slow, but it is accelerated when osmium tetraoxide is present in the reaction vessel. It is a catalyst for the reaction. Oxide AS2O3 is dissolved in a sodium hydroxide solution, and the solution is acidified by the addition of sulfuric acid. Then some drops of an osmium tetraoxide solution are added and the solution under study is titrated with a ceric sulfate solution ... 

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