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Two intersecting lines are drawn on the surface of the cap, the first with aniline or aniline water, the second with an aqueous solution of 65% nitric acid. The test is considered positive when a bright orange color forms where the lines cross. [4] [5] [6] Agaricus placomyces and Agaricus xanthodermus produce false negative reactions. [4] [5]
A 2020 DNA barcoding study isolated C. beccarii from Taiwanese aquarium stores. [7] As an ornamental, the species is sought after for its coloration and for its habit of attaching itself to aquarium furniture. It is easy to cultivate, and if unchecked, may become weedy. [6] It is known to aquarists as "red moss". [3]
Melzer's reagent is an aqueous solution of chloral hydrate, potassium iodide, and iodine.Depending on the formulation, it consists of approximately 2.50-3.75% potassium iodide and 0.75–1.25% iodine, with the remainder of the solution being 50% water and 50% chloral hydrate.
In the test, an excess of manganese(II) salt, iodide (I −) and hydroxide (OH −) ions are added to a water sample causing a white precipitate of Mn(OH) 2 to form. This precipitate is then oxidized by the oxygen that is present in the water sample into a brown manganese -containing precipitate with manganese in a more highly oxidized state ...
Fontinalis antipyretica, [2] greater water-moss, [3] or common water moss, is a species of submerged aquatic moss belonging to the subclass Bryidae. It is found in both still and flowing freshwater in Europe, Asia, Greenland and Africa. In North America it is found in most Canadian provinces with a seaboard and most US states except the most ...
It is rooted in the history of soil science and, more precisely, in the tradition of alkaline extraction, which dates back to 1786, when Franz Karl Achard treated peat with a solution of potassium hydroxide and, after subsequent addition of an acid, obtained an amorphous dark precipitate (i.e., humic acid).
The transformation gives a green-colored melt. Alternatively, instead of using air, potassium nitrate can be used as the oxidizer: 2 KOH + KNO 3 + MnO 2 → K 2 MnO 4 + H 2 O + KNO 2. One can test an unknown substance for the presence of manganese by heating the sample in strong KOH in air. The production of a green coloration indicates the ...
The reagent for the K test is an aqueous solution of potassium hydroxide (KOH) (10–25%), or, in the absence of KOH, a 10% aqueous solution of sodium hydroxide (NaOH, lye), which provides nearly identical results. [4] A 10% solution of KOH will retain its effectiveness for about 6 months to a year. [5]
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