When we know the
titration of the chameleon solution for iron, that for manganese is
obtained by multiplying the former by (3 x 55)/(10 x 56) =0.295. If, for
instance, one cubic centimeter chameleon solution corresponds to 0.01
gramme iron, the figure for manganese is 0.01 x 0.295 = 0.00295 gramme
per cubic centimeter.
We can of course also determine the titration for manganese in a
chameleon solution with the greatest certainty by titrating a compound
of manganese with an accurately estimated content of it, for instance, a
spiegeleisen or ferromanganese; the test is carried out in the following
way: The substance, which is to be examined for manganese, is dissolved
by means of hydrochloric acid. If the manganese, as in slags, be
combined with silica, it is frequently necessary first to fuse the
specimen with soda. Iron ores and refinery cinders may indeed, if they
are reduced to a very fine state of division, be commonly decomposed by
boiling with hydrochloric acid with or without the addition of sulphuric
acid, but the undissolved silica is generally rendered impure by
manganese, which can only be removed by fusion with soda.
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