Alkali meta ions

Figure la shows how the dimensionless M concentration varies with y ( x/L) in case I, II and III. Consistent with equation (16), the alkali meta] ion distributes along the electrical field, which in case III switches sign midway through the membrane. Figure lb examines in detail the concentration and potential profiles in... 

Arsenites of the alkali metals are very soluble in water, those of the alkaline earth metals less so, and those of the heavy metals are virtually insoluble. Many of the salts are obtained as meta-arsenites, e.g. NaAs02, which comprises polymeric chain anions formed by comer linkage of pyramidal ASO3 groups and held together by Na ions ... 

In the reaction of chloronitrobenzene and nitraniline with alkali the halogen atom or the amino group is only mobile in the 0 andp isomers and is replaceable by OH (also by CN, CNS etc.) much more readily than in chlorobenzene or aniline. This is a reaction of the nucleophilic OH- ion. 0-Nitrophenol and some -nitrophenol, but no meta, can indeed be produced from nitrobenzene with alkali also, though with difficulty. 

Defined as those containing only the simple MO ions, they can be obtained from solutions of M03 in aqueous alkali. The MO ions persist as such in basic solution. Although both molybdates and tungstates can be reduced in solution (see later), they lack the powerful oxidizing property so characteristic of chromates(VI). The normal tungstates and molybdates of many other metals can be prepared by meta-thetical reactions. The alkali metal, ammonium, magnesium, and thallous salts are soluble in water, whereas those of other metals are nearly all insoluble. 

Crystals of sodium meta-arsenate-phosphates, being similar to crystals of sodium metaphosphate, are dissolved in solutions of salts of alkali metals other than sodium. These dissolution reactions are considered to be based on ion-exchange reactions (67). About 10 g. of a fine powder of sodium meta-arsenate-phosphate can be dissolved in about 1 liter of a solution of 0.5M potassium nitrate and 0.05M potassium hydroxide. The potassium hydroxide is added to neutralize hydrogen ions produced by the hydrolysis of the arsenate-phosphate. After about 1 hr. almost all the crystals are dissolved. 

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