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Updated: June 5, 2025
The young doctor went very much into details, even so far as giving the various chemical symbols of poison, dwelling long on arsenious acid, whose symbol, he told the reporter, was As2O5, while if one desired to test the organs for traces of strychnine, it would be necessary to use "sodium and potassium hydroxide, ammonia and alkaline carbonate, to precipitate the free base strychnine from aqueous solutions of its salts as a white, crystalline solid," while this imposing formula was given: "C21H22 + NaOH C21H22 + H20 + NaNO3."
It should be added in slight excess only, since the excess must be removed by boiling, which is tedious. !Method C! PROCEDURE. Weigh out into 500 cc. beakers two portions of 0.175-0.200 gram each of pure arsenious oxide. Dissolve each of these in 10 cc. of sodium hydroxide solution, with stirring. Cover the beakers before adding the bicarbonate, to avoid loss.
It is known to the chemist as CaCO3, and forms practically all of very pure limestones. Impure limestones contain some earthy materials that became mixed with the lime carbonate when the rock was being formed. Calcium Hydroxide is a compound made by permitting calcium oxide to combine with water, and is known as lime hydrate.
As an antidote, the best when the poison is in solution is the hydrated sesquioxide of iron, formed by precipitating tinctura ferri perchloridi with excess of ammonia, or carbonate of soda. This is filtered off through muslin and given in tablespoonful doses. It forms ferric arsenate, which is sparingly soluble. Colloidal iron hydroxide may be used instead.
Ammonium hydroxide is a weak base, as shown in the table above, while the hydroxides of sodium and potassium exhibit strongly basic properties. To understand the principle underlying these changes it is necessary to consider first the conditions which prevail when a solution of acetic acid, which has been stirred until it is of uniform concentration throughout, has come to a constant temperature.
Preference is here given to iron crucibles, because the resulting ferric hydroxide is more readily brought into solution than the nickelic oxide from a nickel crucible. The subsequent boiling insures the complete decomposition of the peroxide.
For the highest accuracy in the determination of silica, or of iron and alumina, it is also necessary to examine for silica the precipitate produced in the filtrate by ammonium hydroxide by fusing it with acid potassium sulphate and solution of the fused mass in water.
I had thought it all out, but to no avail because the carbon dioxide produced by our breathing permeated every part of the ship. To absorb it, we would need to fill containers with potassium hydroxide and shake them continually. But this substance was missing on board and nothing else could replace it.
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.
Some of these, notably the hydroxide, combine with acids and contribute to the total alkaline strength, but it is customary to calculate this strength in terms of sodium carbonate; i.e., as though no other alkali were present. PROCEDURE. In order to secure a sample which shall represent the average value of the ash, it is well to take at least 5 grams.
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