Harmonized System

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Section VI > Chapter 28 > Heading 2811

Explanatory notes

… 2811.29 ‑ ‑ Other This heading covers mineral acids and anhydrides and other oxides of non‑metals. The most … silicates and of fluorosilicic acid as impurities). In the anhydrous state, hydrogen fluoride is an extremely …

Section VI > Chapter 28 > Heading 2827

Explanatory notes

… oxides (oxyiodides) of metals or of the ammonium ion (NH 4 + ). Halides and halide oxides of non‑metals are … (1)   Ammonium chloride (sal ammoniac, ammonium muriate) (NH 4 Cl). Results from the neutralisation of hydrogen … of the extraction of potassium salts. Occurs either in anhydrous translucent masses, cylinders, tablets or prisms, …

Section VI > Chapter 29 > Heading 2921

Explanatory notes

… ammonia has been replaced, the result is a primary amine (RNH 2 ); replacement of two hydrogen atoms gives a secondary amine (R-NH-R 1 ); and replacement of three hydrogen atoms results in … AND THEIR DERIVATIVES; SALTS THEREOF (1) Methylamine (CH 3 NH 2 ). Colourless, inflammable gas with a strong, …

Section VI > Chapter 28 > Heading 2825

Explanatory notes

… (1)     Hydrazine and its inorganic salts .     Hydrazine (NH 2 .NH 2 ), a basic product prepared by the oxidation of ammonia … with sodium hypochlorite. Also exists as the hydrate (NH 2 .NH 2 .H 2 O). Colourless, lachrymatory liquid which …

Section VI > Chapter 28 > Heading 2833

Explanatory notes

… sulphate (neutral sulphate) (Na 2 SO 4 ). Occurs in the anhydrous or hydrated state as a powder or in large … melts in its water of crystallisation, giving finally the anhydrous sulphate. Used in dyeing as a mordant; in tanning …

Section VI > Chapter 29 > Heading 2924

Explanatory notes

… which contain the following characteristic groups : (–CONH 2 ) ((–CO) 2 NH) ((–CO) 3 N) Primary amide Secondary … acid radicals. This heading excludes , however, urea (H 2 NCONH 2 ), the diamide of carbonic acid, which is …

Section VI > Chapter 28 > Heading 2842

Explanatory notes

… The most important are : (a)   Ammonium thiocyanate (NH 4 SCN). Colourless crystals, deliquescent, very soluble … of crystallisation) and trisodium orthoarsenate (anhydrous or with 12 H 2 O). Prepared from arsenious oxide … Iron ( ammonium ferrous sulphate, Mohr’s salt) (FeSO 4 .(NH 4 ) 2 SO 4 .6H 2 O). Light green crystals, soluble in …

Section VI > Chapter 29 > Heading 2925

Explanatory notes

… - - Other (A) IMIDES Imides have the general formula (R=NH), where R is a dibasic acyl radical. (1) Saccharin or … Imines , like imides, are characterised by the group =NH, but it is linked to a non-acidic organic radical : (R 2 … oxygen of the ( C=O) group by an imino group (=NH) : H 2 NCONH …

Section VI > Chapter 28 > Heading 2806

Explanatory notes

… by ions with analogous properties, e.g., the ammonium ion (NH 4 + )) as a result salts are formed. Acids react with … of water are eliminated from those acids containing oxygen, anhydrides are obtained. Most oxides of non‑metals are …

Section VI > Chapter 29 > Heading 2937

Explanatory notes

… or animals, extremely small amounts of which are capable of inhibiting or stimulating the functioning of particular … as their receptor agonists and antagonists. (d)    Leukemia-inhibiting factor (human) growth factor emfilermin (INN) ( …