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Updated: April 30, 2025
"It is worth while to know that about two and one-half per cent. of the earth's crust is potassium, while about one-tenth of one per cent. is phosphorus; also that when a hundred bushels of corn are sold from the farm, seventeen pounds of phosphorus, nineteen of potassium, and seven of magnesium are carried away.
NaOH = 1 cc. of H PO solution of which 1 cc. will precipitate 0.01227 gram of magnesium as MgNH PO . Calculate the percentage of KHC H O . !Answer!: 88.67%. A one-gram sample of sodium hydroxide which has been exposed to the air for some time, is dissolved in water and diluted to exactly 500 cc.
If only the grain, including a yield of 4 bushels an acre of clover seed, is considered, the straw, stalks and hay being returned to the soil either directly or in farm fertilizer then the loss per acre from four years of cropping as above would be as follows: Potassium 51 pounds Magnesium 16 pounds Calcium 5 pounds Phosphorus 42 pounds
This soil is evidently residual, formed in place from the disintegration of the underlying rock. The soil may represent only a small part of the original rock, because of the loss by leaching. Here are the amounts of plant food found in two million pounds of the subsoil: 590 pounds of nitrogen 1,980 pounds of phosphorus 37,940 pounds of potassium 24,808 pounds of magnesium 31,320 pounds of calcium
They went briskly to the shattered part of the ship and picked up a metal girder neatly matching the one that leaned absurdly where it was fixed in the icy surface. By the ease of their movements, it could not be heavy. It would have to be aluminum or magnesium to be so light. Magnesium alloy, at a guess. One boy held it upright by the slanting beam.
Although these plates are not nearly so fast as gelatine plates, it may surprise you to be told that working with a negative which to daylight at this dull time of the year required an exposure of sixteen minutes, will, I hope, give me good results in about a tenth of this time; and this I obtain by burning magnesium ribbon.
Iron, calcium, potassium, sodium, and magnesium, in this order, complete the eight abundant elements, which aggregate about ninety-eight per cent. of the solid crust of the earth.
Sometimes as they marched they would see the starshells, going up and bursting like rockets, and coming down With a wavering slow settling motion, as white and bright as burning magnesium wire, shedding a kind of dust of light upon the trench and making the blackness intense when they went out.
This gallery was all of aluminium magnesium alloy, the tight front of the air-ship swelled cliff-like above and below, and the black eagle sprawled overwhelmingly gigantic, its extremities all hidden by the bulge of the gas-bag. And far down, under the soaring eagles, was England, four thousand feet below perhaps, and looking very small and defenceless indeed in the morning sunlight.
Strips of magnesium were laid like bridging planks across chunks of lava, and in the dust all around were countless curious scrabbled marks. Rodan stood carefully on a magnesium strip, and looked back at Nelsen and Lester, his brows crinkling as if he was suspicious that he had already told them too much.
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