Sulphate manganous

Polissar has observed 100 % exchange between Mn(III), as the oxalato ion Mn(Ox)J, and manganous sulphate. Adamson, using manganic chloride as the source of Mn(III), has observed the exchange to be incomplete in a time 15 sec with reactant concentrations 10 M. Both workers used a separation technique based on the precipitation of Mn(IV), present via the equilibrium... 

Kemp and Waters found a primary kinetic isotope effect of 8.7 for oxidation of C-deuterated mandelic acid and noted a large difference in rate between the oxidations of mandelic acid k at 24.4 °C = 1.7 l.mole . sec ) and a-hydroxy-isobutyric acid ( 2 at 24.4 °C = 5.6 x 10 l.mole . sec ) — a difference not reproduced for the oxidation of these compounds by the one-equivalent reagent, manganic sulphate. The various data are fully in accord with a Westheimer-type mechanism, viz. 

Ammino-manganous Sulphates.—Anhydrous manganous sulphate slowly absorbs ammonia gas, increasing in volume with formation of hexammino-manganous sulphate, [Mn(XH3),.]S04. In vacuo it loses four molecules of ammonia and is transformed into the diarnmine, [Mn(NH3)JS04. The latter, however, seems incapable of reabsorbing ammonia to form the hexammine.2... 

Tetrammino-manganous Sulphate, [Mn(XH3).,]S04, is described by Rose 3 as the compound which is formed by allowing anhydrous sulphate to absorb ammonia. The salt falls to a white powder, and if kept for some time in a closed tube it turns brownish white, and in air loses ammonia. Solution in water causes the precipitation of manganous hydroxide. 

Pentammino-manganous Sulphate Jlonohydrate, [Mn(NHg)j]SO4.H20, is produced by drying the hydrated salt at 160° C., when it slowly absorbs ammonia, increasing in volume and forming the pentammine. 

Hydroxylamino-manganous Sulphate, [Mn(NH2OH)]S04.2H20, is a white powder insoluble in water.5... 

Dihydrazino-manganous Sulphate, [Mn(N2H4)2]SOt, is a white crystalline unstable powder.6... 

Ammonium manganous sulphate (6H2O) [13566-22-8] M 391.3. Crystd from water (2ml/g) by partial evapn in a desiccator. 

Manganous sulphate (H2O) [10034-96-5] M 169.0. Crystd from water (0.9ml/g) at 54-55° by evaporating about two-thirds of the water. 

The tetrahydrate is also formed when the heptahydrate is kept for several days over concentrated sulphuric acid.5 It is monoclinic, and isomorphous with the corresponding hydrate of manganous sulphate, MnS04.4H20. Its limits of stability in contact, with a saturated solution of ferrous sulphate are 56 6° C. to 64 4° C.6 Its heat of solution at 13-5° C. is 1599 calories,7 and its molecular heat is 63 587 calories.8... 

Potassium permanganate is instantaneously decolorised by ferrous sulphate in acid solution, being reduced to manganous sulphate. Thus... 

Addition of manganous sulphate, phosphoric acid, and of other substances to the liquid to be titrated has been found to reduce the error.5... 

If manganous sulphate, MnSO, yields 42.392 per cent of oxygen, what is the atomic weight of manganese ... 

In acid solution (sulphuric add), no manganese dioxide separates out, since it is dissolved by the sulphuric add, with evolution of oxygen, to form manganous sulphate ... 

Manganous sulphate MnS04 4H20 Sulphate of manganeee sulphate of protoxide of manganese. 

Manganous Sulphate—Mangani anlpiui (f. ST.)—MnSO -f Aq—150 4-nl8—is forineil by the action of H.BO on MnO. Below 6 (42 .8 F.) it crvstallizes with 7 Aq, and is isomorphous with ferrous sulphate j between 7 -20 (44 .6-68 F.) it forms cryTitiUs with 5 Aq, and is isomorphous with cupric sulphate between 20 -30 f68 = -66 = F.) it cnstallizes with 4 A. It is Tose-colored, darker as the proportion of Aq increases soluble m H.O, instduble in alcohol. With the alkaliue sulphates it forma double salts, with 6 Aq. 

Two molecules of potassium permanganate in the acid solution furnish five active oxygen atoms, which convert five molecules of oxalic acid into carbon dioxide and water. The rate of the oxidation of oxalic acid by potassium permanganate is markedly accelerated by the presence of manganous sulphate. At first the reaction proceeds slowly, but after a few drops of the solution of potassium permanganate have reacted the decolorization takes place instantly. 

Experimental results on velocity of trigger waves in acidic bromate oxidation of ferroin have been reported by Field and Noyes [18] and Showalter [24]. A semi-quantitative comparison with experimental results shows that the observed velocity is proportional to square root of the product of [H+] and [BrOj ] as theoretically predicted. However, deviations have been observed depending on experimental conditions. Thus, in the case of malonic acid -I- bromate -t- manganous sulphate -1- ferroin in H2SO4 medium, the wave velocity is found [25] to be proportional to [Br03 ]y [H+]. Similar results are obtained for citric acid -I- BrOj -I- Mn - - H2SO4 system [26]. 

Procedure. Transfer 1-2 ml. of the solution to be analysed to a distillation flask together with 1-9 ml. of 2 N phosphoric acid. After the addition of 5 ml. of a 10 per cent solution of manganous sulphate, dilute the... 

Mandelic add in bile and urine can be determined after separation of the bile acids, and conversion to benzaldehyde by means of zinc manganite (prepared from zinc sulphate, manganous sulphate and zinc oxide after addition of potassium permanganate). The wave of benzaldehyde is measured in a phosphate pH 7-7 buffer. 

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