Hydrogen peroxide reacting with

In what way does a solution of hydrogen peroxide react with (a) chlorine water, (b) potassium permanganate solution, (c) potassium dichromate solution, (d) hydrogen sulphide 50 cm of an aqueous solution of hydrogen peroxide were treated with an excess of potassium iodide and dilute sulphuric acid the liberated iodine was titrated with 0.1 M sodium thiosulphate solution and 20.0 cm were required. Calculate the concentration of the hydrogen peroxide solution in g 1" ... 

Solid Peroxygen Compounds. Hydrogen peroxide reacts with many compounds, such as borates, carbonates, pyrophosphates, sulfates, sihcates, and a variety of organic carboxyHc acids, esters, and anhydrides to give peroxy compounds or peroxyhydrates. A number of these compounds are stable sohds that hydrolyze readily to give hydrogen peroxide in solution. 

Discussion. Hydrogen peroxide reacts with iodide in acid solution in accordance with the equation ... 

To understand how these parameters affected the efficiency of the chemiluminescent reaction, we examined the mechanism originally proposed by Rauhut (26). As shown in Scheme 2, hydrogen peroxide reacts with an oxalate ester, such as 2,4,6-trichlorophenyl oxalate (TCPO), in a two-step process to form a reactive intermediate for which Rauhut suggested structure 1, the 1,2-dioxetanedione. The dioxetanedione then interacts with an acceptor (ACC) to produce two molecules of COj and the excited state of the acceptor. The last stage of the sequence is fluorescence emission from the acceptor. 

A better explanation can be given by considering the fact that the induced reduction of peroxydisulphate is observed only when hydrogen peroxide reacts with 1-equivalent oxidizing agents. This reaction takes place in steps... 

Since for an endothermic reaction the activation energy E > AH, all such reactions cannot explain the experimental value of the activation energy (see Chapter 4). The following mechanism seems to be the most probable now. Hydrogen peroxide is protonized in a polar alcohol solution. Protonization of H202 intensifies its oxidizing reactivity. Protonized hydrogen peroxide reacts with alcohol with free radical formation. 

A sensitive method of determination of H2O2 is by the so-called peroxalate reaction luminescence (reaction 24) by which hydrogen peroxide reacts with an aryl oxalate... 

Metal-catalyzed nitration by peroxynitrite also provides an alternative explanation to the Haber-Weiss reaction for the role of transition metals in oxidative tissue injury. The rate of peroxynitrite reaction with Fe " EDTA is 5700 M , which is in the same range as the rate of hydrogen peroxide reacting with... 

Hydrogen peroxide reacts with 2,4,6-trisubstituted pyrylium salts to cause ring contraction (213 — 214). If there is a free a- or y-position, pyrylium salts can be oxidized to pyrones (215 — 216). 

Hydrogen peroxide reacts with ozone when present as anion, H02. The reaction rate of the system ozone/hydrogen peroxide is based on the initial concentration of both oxidants ... 

Chromium peroxide (CrOs), obtained by the oxidation of chromium trioxide with hydrogen peroxide, reacts with amines forming complexes, like 2,2 -bipyridylchromium (BPCP) and pyridinechromium (PCP) peroxides, that oxidize efficiently alcohols to aldehydes and ketones 426b... 

Depending on the pH of the medium, ionic species will have either nucleophilic character (pH > 7) or electrophilic character (pH < 7). In an alkaline medium, hydrogen peroxide reacts with hydroxide anions to give perhy-droxyl anions HOO according to the equilibrium. 

Cyclodextrin ketones have been used as powerful catalysts of amine oxidation in the presence of hydrogen peroxide as the stoichiometric oxidant. This oxidation follows Michaelis-Menten kinetics and depending on the substrate the oxidation rate is increased up to 1100-fold. It has been proposed that hydrogen peroxide reacts with the ketone to form a hydroperoxide adduct and this adduct is responsible for oxidizing the amine, bound in the cavity, to the hydroxylamine.189... 

Hydrogen peroxide reacts with some acids (sulphuric acid for instance) and forms peroxy-acida, and with some bases [such as Ca(OH2), Ba(OH)2, Mg(OH)2, Zn(OH)2] and forms peroxides. Oxides of the IV and VI group of the periodic system (i. e. oxides of Ce, Ti, V, Nb, Ta, Cr, Mo, W, U) also react with hydrogen peroxide to form peroxides, peroxy-acids and persalts. Many additive compounds of hydrogen peroxide are known such as with sodium metaborate, urea and hexamethylene-tetramine. 

If hydrogen peroxide reacts with a solution of sodium tetraborate in an alkaline medium, sodium perborate is formed according to equation ... 

Figure 2.37 Equilibrium present when hydrogen peroxide reacts with a carboxylic acid.

Rubidium peroxide hydrate, RbO-OH,HaOa.—Hydrogen peroxide reacts with rubidium hydroxide in alcoholic solution to form the peroxide hydrate, a white, deliquescent solid, stable below 0° C., but decomposing at higher temperatures with evolution of oxygen, and formation of a substance which is probably a hydrated tetroxide.18... 

HFP is thermally stable up to 400°C to SOOT (752°F to 932°F). At about 600°C (1112°F) under vacuum, HFP decomposes and produces octafluoro-2-butene (CF3=CFCp3) and octafluoroisobutylene [44]. Under basic conditions, hydrogen peroxide reacts with HFP to form hexafluoropropylene epoxide, which is an intermediate in the preparation of perfluoroalkylvinyl ethers [45,46]. Hexafluoropropylene readily... 

Hydrogen peroxide reacts with aliphatic and aromatic nitriles in alkaline solution at 50° to give amides in 50-95% yields. 

Alkaline hydrogen peroxide reacts with a jS-unsaturated ketones by a different reaction sequence, exemplified by the behaviour of "A-nor-testosterone 27) [7 ]. The reagent first converts the steroid into the corresponding epoxy-ketone 28) by the mechanism discussed on p. 201, and only then brings about a Baeyer-Villiger oxidation of the ketone function to give the epoxy-lactone (29) as the major product. 

When hydrogen peroxide reacts with nitrite, pernitrous acid forms as an intermediate of appreciable stability. The rates of its formation have been examined for solutions buffered to pH 4-6 (phosphates) and without buffers. 

Hydrogen peroxide reacts with acidified molybdate solutions. Chaveau, Souchay and Tridot (1955) have shown the presence of the acid H2M02O44 in solutions of molybdate in concentrated perchloric acid to which HgOg has been added. The so-called permolybdic acid is regarded as a salt of this acid with the cation [HMo20g]+, not itself peroxidic. 

Hydrogen peroxide reacts with fatty acids in the stomach to form hydroxyl radicals. Hydroxyl free radicals are probably one of the major factors in many degenerative diseases, including cancer. Much of the body contains enzymes that quickly break up H202 into oxygen and water. But the stomach and intestinal tract contain very little of these protective enzymes, so ulceration of the lining could theoretically develop. Ulceration can lead to hyperplasia, and hyperplasia to cancer. 

Hypochlorite bleaching can be accelerated by the addition of hydrogen peroxide, ammonia, chloramine etc. [7, 8], Hydrogen peroxide reacts with hypochlorite forming hydroxyl and HO radicals. The hydroxyl radical may react as before or Hp + Cl O HO/+OH-... 

In the presence of metals, such as iron, hydrogen peroxide reacts with superoxide anion to produce hydroxyl radicals (OH ) and singlet oxygen ( O2) by the reaction shown below ... 

---