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The dihydrate NiCl 2 ·2H 2 O adopts a structure intermediate between the hexahydrate and the anhydrous forms. It consists of infinite chains of NiCl 2, wherein both chloride centers are bridging ligands. The trans sites on the octahedral centers occupied by aquo ligands. [10] A tetrahydrate NiCl 2 ·4H 2 O is also known.
Nickel(II) fluoride NiF 2 is yellow, crystallising in the rutile structure and can form a trihydrate, NiF 2 ·3H 2 O. [3] A tetrahydrate also exists. [4] Nickel chloride NiCl 2 is yellow, crystallising in the cadmium chloride structure. It can form a hexahydrate, NiCl 2 ·6H 2 O, a tetrahydrate NiCl 2 ·4H 2 O over 29 °C and a dihydrate, NiCl ...
The compound can be prepared by treating nickel or nickel(II) carbonate with acetic acid: . NiCO 3 + 2 CH 3 CO 2 H + 3 H 2 O → Ni(CH 3 CO 2) 2 ·4 H 2 O + CO 2. The mint-green tetrahydrate has been shown by X-ray crystallography to adopt an octahedral structure, the central nickel centre being coordinated by four water molecules and two acetate ligands. [5]
Crystallographic analysis reveals that the solid consists of [trans-NiCl 2 (H 2 O) 4] subunits that are hydrogen bonded to each other as well as two additional molecules of H 2 O. Thus one third of the water molecules in the crystal are not directly bonded to Ni 2+ , and these might be termed "water of crystallization".
Dichlorobis(ethylenediamine)nickel(II) is the inorganic compound with the formula NiCl 2 (en) 2, where en = ethylenediamine. The formula is deceptive: the compound is the chloride salt of the coordination complex [Ni 2 Cl 2 (en) 4] 2+. This blue solid is soluble in water and some polar organic solvents.
NiF 2 is prepared by treatment of anhydrous nickel(II) chloride with fluorine at 350 °C: [2]. NiCl 2 + F 2 → NiF 2 + Cl 2. The corresponding reaction of cobalt(II) chloride results in oxidation of the cobalt, whereas nickel remains in the +2 oxidation state after fluorination because its +3 oxidation state is less stable.
Rather they refer to what percentage of the total weight is milk fat. For example, one cup of milk weighs about 225 grams. Of that weight, 2% milk holds 5 grams of fat and whole milk contains 8 grams.
As a dihydrate, nickel formate is a green, odorless, non-flammable solid that is sparingly soluble in water. [2] The compound has a monoclinic crystal structure. [3] The anhydride forms on careful heating at 130–140 °C. [6] When heated in a vacuum to 300 °C, pure nickel is formed: [5] Ni(HCO 2) 2 (H 2 O) 2 → Ni + 2 CO 2 + 2 H 2 O + H 2