Rubidium nitrate

Self-Test J.2A What acid and base solutions could you use to prepare rubidium nitrate Write the chemical equation for the neutralization. 

F. Wallerant found that when mixed crystals are formed with increasing proportions of rubidium nitrate, the transformation point of caesium nitrate was lowered from 161°, until, with 75 per cent, of RbNOa, it reaches 145° the transition... 

Fig. 79.—Effect of Pressure on the Transition Temperature of Rubidium Nitrate.

It will be observed that the m.p. of rubidium nitrate is lower than that of potassium nitrate, while that of caesium nitrate is higher. This is an unusual sequence in the properties of the alkali salts—see the solubilities for another irregularity. 

Unlike the results calculated for degrees of ionization from the depressions of the f.p., the values of Ostwald s constant computed from the electric conductivities of soln. of rubidium nitrate show marked deviations from constancy and they are thus constant with results with other strong electrolytes—the rubidium ion Rb and the N0V4on are among those with the greatest electro-affinities. The electrical conductivity of lithium nitrate is greater in methyl alcohdl than in water, but in... 

Rubidium nitrate [13126-12-0] M 147.5. Crystd from hot water (0.25ml/g) by cooling to room temperature. 

It is seen that the transition occurs at about p = 0.67, and that this is the value of p for the dimorphous substance calcium carbonate. At P = 0.85 transition occurs to other structures, shown by rubidium nitrate and cesium nitrate, in which the univalent cation probably has ligancy twelve. 

Rubidium Dihydrogen Orthoarsenate, RbH2As04, is obtained in the anhydrous form by fusing together equal parts of arsenious oxide and rubidium nitrate, or by neutralising rubidium carbonate solution with arsenic acid using methyl orange as indicator in the former method it yields tabular crystals and in the latter silky needles. At a dull red heat it forms the metarsenate. 

Rubidium nitrate, RbN03.—The nitrate is trimorphous,3 crystallizing in hexagonal,4 cubic, and bi-refractive forms, the transition-points in the order named being 161 4° C. and 218 9° to 219 3° C. The crystals are very hard, melt at 313° C.,5 and have a density of 3-1316 at 15° C. and 3-112 at 20° C.7 The molecular electric conductivity of rubidium nitrate between 318-8° and 493° C. is given by the formula 8... 

Typical experimental curves obtained with this new chromatographic method are presented in Fig. 17. In these experiments the solution of cesium and rubidium (X( = 0.1), salt mixture (0.45M), and alkali (0.3M) was passed through a fixed-bed column filled with sulfophenolic cation exchanger KU-I (the bed height was 28 cm., its diameter was 8 mm) previously equilibrated with 0.45 M solution of cesium and rubidium nitrate (1 9). 

J. L. Andreae, etc. According to M. L. Frankenbeim, the rbombobedral form of potassium nitrate is more soluble than the prismatic variety, and more readily forms Under-cooled soln. The data for rubidium and caesium nitrates are by the Earl of Berkeley. It will be observed that as in the case of the m.p. of the alkali nitrates the regular sequence is broken with rubidium nitrate, for its solubility is greater than that of potassium nitrate, while that of caesium nitrate is less. 

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