[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.