These conditions are somewhat imperfectly copied in the
ordinary vortex box, which is usually cubical in form, with a circular
orifice in one side, and a covering of canvas on the opposite one,
which is hit with the fist.
* * * * *
[AMERICAN CHEMICAL JOURNAL.]
THE DETERMINATION OF NITRIC ACID BY THE ABSORPTION OF NITRIC OXIDE
IN A STANDARD SOLUTION OF PERMANGANATE OF POTASSIUM.
By H.N. MORSE and A.F. LINN.
The method which we propose consists in the conversion of the nitric
acid into nitric oxide; the absorption of the latter in a measured,
but excessive, quantity of a standard solution of permanganate of
potassium; and the subsequent determination of the excess of the
permanganate by means of a standard solution of oxalic acid or
sulphate of manganese.
THE APPARATUS.
A is an apparatus for the generation of carbon dioxide free from air,
which will be explained hereafter.
B is a flask, having a capacity of 125 or 150 c.c., in which the
nitrate is decomposed in the usual manner by means of ferrous chloride
and hydrochloric acid.
C is a small tube for the condensation of the aqueous hydrochloric
acid which distills over from B.
D is a Geissler bulb, containing a concentrated solution of potassium
carbonate, to arrest any acid vapors coming from C.
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