If
sulphuric acid at 190 deg. to 200 deg. is allowed to act upon morphia, there is
ultimately formed an opaque black green mass. If this is poured dropwise
into much water, the mixture turns bluish, and if it is then shaken up
with ether or chloroform, the form takes a purple and the latter a very
permanent blue. Codeine gives the same reaction, but no other of the
alkaloids. This reaction can be obtained very distinctly with 0.0004
grm. of morphia.
* * * * *
ON THE ESTIMATION OF MANGANESE BY TITRATION.
[Footnote: _From Jernkontorets Annaler_, vol. xxxvi.--_Iron_.]
By C. G. SARNSTROM.
If we dissolve black oxide of manganese, permanganate of potash, or any
other compound of manganese of a higher degree of oxidation than the
protoxide in hydrochloric acid, we obtain, as is well known, a dark
colored solution of perchloride of manganese, which, when heated to
boiling loses color pretty rapidly, chlorine being given off, until
finally only protochloride remains. This decomposition also proceeds at
the common temperature, though much more slowly, and we may therefore
say that manganese when dissolved in hydrochloric acid always tends to
descend to its lowest, and, considered as a base, strongest degree of
oxidation, which is not raised to a higher degree even by chameleon
solution.
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