Manganese -ammonium phosphate

Pink precipitate of manganese ammonium phosphate, Mn(NH4)P04-7H20, which is soluble in acids... 

See manganese blue and barium manganate(VI) sulfate. Manganese ammonium phosphate... 

Modem sources, such as Hackman (1973), typically give manganese ammonium phosphate ((NH4)2Mn2(P207)2) as the formula for manganese violet See manganese phosphates group. 

Manganese group Manganese ammonium phosphate Purpurite Manganese violet Niimberg violet Permanent mauve Cariyle (2001) 503 Standage (1892)... 

Salter (1869) gives this as a synonym for mars violet (. v.), a term which could be applied to various compounds including a natural occurring ochre, a mixture that duphcated the colour or other compounds. A mineral violet was produced by the British colourmen Roberson s. Heaton (1928) also refers to mineral violet, although he indicates that it was at that time an obsolete or rarely used term for manganese phosphate. None-the-less, Hackman was still listing the term (as a manganese ammonium phosphate) in 1973. 

Manganese phosphates group Manganese ammonium phosphate] Manganese violet Hackman (1973)... 

Derived from Ammonium Phosphate, Potassium Phosphate, Potassium Nitrate, Urea, Iron EDTA, Manganese EDTA and Zinc EDTA. 

If ammonium salts are absent, manganese(II) phosphate is formed ... 

Soluble salts of copper, manganese, iron, and zinc are likely to become insoluble when Incorporated in ammonium phosphates or ammoniated mixed fertilizers. The reaction forms one of several metal ammoriiufrr phosphates such as ZnNH4P04. In general, the water solubility decreases with increase in pH of the fertilizer product. Loss of water solubility does not necessarily imply loss of effectiveness but may delay it. Sodium borate when incorporated in ammoniated fertilizers containing calcium may become partially or wholly insoluble presumably because of formation of calcium borate. The boron in calcium borate is insoluble in cold water but soluble in boiling water.) This effect has been noted with nitrophosphate fertilizers and may occur with other formulations. 

Cobalt orthojiiosphate Manganese ammonium pyrophosphate Zinc phosphate Lead phosphates... 

The solubility of the precipitates encountered in quantitative analysis increases with rise of temperature. With some substances the influence of temperature is small, but with others it is quite appreciable. Thus the solubility of silver chloride at 10 and 100 °C is 1.72 and 21.1mgL 1 respectively, whilst that of barium sulphate at these two temperatures is 2.2 and 3.9 mg L 1 respectively. In many instances, the common ion effect reduces the solubility to so.small a value that the temperature effect, which is otherwise appreciable, becomes very small. Wherever possible it is advantageous to filter while the solution is hot the rate of filtration is increased, as is also the solubility of foreign substances, thus rendering their removal from the precipitate more complete. The double phosphates of ammonium with magnesium, manganese or zinc, as well as lead sulphate and silver chloride, are usually filtered at the laboratory temperature to avoid solubility losses. 

The magnetic susceptibility, measured with a vibrating sample magnetometer (Foner), calibrated with nickel (purity 99.99% — specific susceptibility at 293°K 55 cgs/g) at 293 0.2°K with a magnetic field of 17,700 G, is 101.39 0.20 10"6 cgs/g. This value may be compared with 101.65 0.20 10 6 cgs/g for manganese diphosphate prepared by thermal decomposition of the ammonium manganese phosphate. The value calculated from Reference 7 is 101.96 0.20 cgs/g. 

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