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Updated: May 28, 2025
The solution which contains the greater portion of manganese, suspended as peroxide, must first, therefore, be boiled to decompose the ammonium carbonate; the remainder of the ammonium oxalate is neutralized with nitric acid, and the manganese converted into the sulphide by ammonium sulphide. The manganese sulphide is then ignited in a current of hydrogen, and weighed as such.
Of course, the idea that lime was beneficial to Cactuses sprang from the knowledge that it existed in large quantities in the soil in which the plants grew naturally, and it is often found in abundance, in the form of oxalate of lime, in the old stems of the plants.
This precipitate is separated by filtering, washed, dried and when separated from the filter, is collected upon dark satinized paper; the filter itself is burned and the ash added to the oxalate of lime. This oxalate of lime is then heated to a dark red heat in a platinum crucible with lid until the oxalate of lime is converted into carbonate of lime.
Those in most common use are iron wire, ferrous ammonium sulphate, sodium oxalate, oxalic acid, and some other derivatives of oxalic acid. With the exception of sodium oxalate, these all contain water of crystallization which may be lost on standing. They should, therefore, be freshly prepared, and with great care.
"The method I employed was to take a little of the blood and add some oxalate of ammonium to it, then shake it up thoroughly with ether to free the hemoglobin from the corpuscles. I then separated the ether carefully from the rest of the blood mixture and put a few drops of it on a slide, covered them with a cover slip and sealed the edges with balsam.
WHITE LEAD. White oxide of lead is often adulterated by the carbonate of lime. To detect this pour four drams of pure acetous acid, over a dram of the suspected oxide. This will dissolve both oxide and chalk; but if a few drops of a solution of oxalic acid be now poured in, a very abundant white precipitate of oxalate of lime will take place.
The electrolysis is best effected in the presence of a sufficient quantity of ammonium oxalate; no separation of any iron compound takes place. The iron is deposited in the form of a bright, steel gray, firmly-adhering mass on the platinum dish. The iron may be exposed to the air for several days without any noticeable oxidation taking place.
How much water must be added to a liter of the oxalate solution to make it exactly 0.025 N as a reducing agent? !Answer!: 5564 cc. The normal value of the oxalate solution when used as an acid is 0.1315. Calculate the ratio of tetroxalate to oxalate used in making up the solution and the normal value of the solution as a reducing agent. !Answers!: 2:1; 0.1577 N.
At present, sodium oxalate is considered to be one of the most satisfactory standards. !Method A! !Iron Standards! The standardization processes employed when iron or its compounds are selected as standards differ from those applicable in connection with oxalate standards. The procedure which immediately follows is that in use with iron standards.
A limestone is found to contain 93.05% CaCO , and 5.16 % MgCO . Calculate the weight of CaO obtainable from 3 tons of the limestone, assuming complete conversion to oxide. What weight of Mg P O could be obtained from a 3-gram sample of the limestone? !Answers!: 1.565 tons; 0.2044 gram. A sample of dolomite is analyzed for calcium by precipitating as the oxalate and igniting the precipitate.
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