^^Q MUTUAL PRECIPITATIONS OF METALLIC OXIDESi 



General infer- readily feparating the copper from a folution of filver. It is 

 cnces* gg^j-y ^^ accumulate ihefe applications by extending them to a 



greater number of fubftances. Thus, the oxides of cobalt and 

 nickel do not neutralize the acids equally ; that of the two 

 which neutralizes it moft, will be able to { recipifate the other, 

 and remain alone in the folution. Thus, alio, fince glucine 

 neutralizes the acids much better than highly oxided iron, it 

 will be eafy to feparate this metal from its folutions, by firft 

 oxidating it llrongiy, and afterwards precipitating one part of 

 the folution, to employ it, after being well waflied, to pre- 

 cipitate the iron of the other part. 



The greater or lefs affinity of the metals for oxigen does not 

 give them any particular property with refpeft to the mutual ,; 

 precipitation of their oxides. 



Oxidation produces a variation in the affinity, or the capacity 

 for faluration of the oxides for the acids ; neverthelefs, the 

 refuUs are only feniible inafmuch as they produce a change in 

 the neutralization, and in this cafe they may be attributed to 

 the latter caufe. 



The affinity of the oxides for the acids may indeed con- 

 tribute to their mutual precipitations, but its effedls are very 

 limited. 



It appears, therefore, in general, that, all circuraflances 

 remaining otherwife the fame, the fubftances which neu- 

 tralize the acids bell, may precipitate the others from their 

 folutions. 



I repeat in concluding, that it is only on the fa6ts which I 

 have related that I have eflabliflied my reafoning, and that 

 it was not my obje6l in thk note to fpeak of the precipitations 

 by the metals, nor of tkofe which are owing to the reciprocal 

 adion of the oxides, or to that of the latter and the alkalis. 



A Report 



