The phase rule and its applications . norgan. Chan., 1904, 42. 250. 302 THE PHASE RULE Bi203,N205,2HoO (represented by B^,,) Bi203,N205,H20 ( „ „ B^,) 6Bi203,5N205,9H20 ( „ „ B6_^9) 2Bi203,N205)H20 ( „ „ B^,,) Probably some others also exist. The problem now is to findthe conditions under which these different normal and basicsalts can be in equilibrium with solutions of varying concen-tration of the three components. Having determined theequilibrium conditions for the different salts, it is then possibleto construct a model similar to that for MgCl2—KG—H20 orfor FeCl3—HC1—H20, from which it w
The phase rule and its applications . norgan. Chan., 1904, 42. 250. 302 THE PHASE RULE Bi203,N205,2HoO (represented by B^,,) Bi203,N205,H20 ( „ „ B^,) 6Bi203,5N205,9H20 ( „ „ B6_^9) 2Bi203,N205)H20 ( „ „ B^,,) Probably some others also exist. The problem now is to findthe conditions under which these different normal and basicsalts can be in equilibrium with solutions of varying concen-tration of the three components. Having determined theequilibrium conditions for the different salts, it is then possibleto construct a model similar to that for MgCl2—KG—H20 orfor FeCl3—HC1—H20, from which it will be possible to deter-mine the limits of stability of the different salts, and to predictwhat will occur when we bring the salts in contact with solu-tions of nitric acid of different concentrations and at differenttemperatures. For our present purpose it is sufficient to pick out onlysome of the equilibria which have been studied, and which arerepresented in the model (Fig. 119). In this case use has 100 ,. 100 ho Fig. 119. been made of the triangular method of representation, so thatthe surface of the model lies within the prism. This model shows the three surfaces, A, B, and C, whichrepresent the conditions for the stable existence of thesalts B^!.!, Sjo, and S3 in contact with solution at different ISOTHERMAL CURV&S AND SPACE UODEL 303 temperatures. The front surface of the model represents thetemperature 9°, and the farther end the temperature 75*5°. Thedotted curve represents the isotherm for 200. The prominencesbetween the surfaces represent, of course, solutions which aresaturated in respect of two solid phases. Thus, for example,pabc represents solutions in equilibrium with B^^ and S10;and the ridge qdc, solutions in equilibrium with S10 and S*The point />, which lies at 75*5°, is the point of maximumtemperature for S10. If the temperature is raised above thispoint, S10 decomposes into the basic salt B1_1_1 and point is th
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