Thus [NaOH Aq, HNO 3 Aq] =13680 cal.
An acid is said to be monobasic, dibasic, tribasic, &c., according to the number of replaceable hydrogen atoms; thus HNO 3 is monobasic, sulphuric acid H 2 SO 4 dibasic, phosphoric acid H 3 PO 4 tribasic.
nitrous oxide, N 2 0, nitric oxide, NO, nitrogen trioxide, N203, nitrogen peroxide, N02, and nitrogen pentoxide, N205, whilst three oxyacids of nitrogen are known: hyponitrous acid, H2N202, nitrous acid, HN02, and nitric acid, HNO 3 (q.v.).
By experiments on diffusion this constant has been found by Scheffer, and the numbers observed agree with those calculated (HC1= 2.30, HNO 3 = 2 22, NaCI = I II).
The reaction is therefore: SO 2 + 0 + HNO 2 = SO 5 NH.
Mez., 18a Hno n iry rrro inn 1 771:' Die Juden in Babylonien ii.
These compounds may be divided into two classes, namely, the true diazo compounds, characterized by the grouping -N=N-, and the diazonium compounds, characterized by the grouping N: N < The diazonium compounds were first discovered by P. Griess (Ann., 1858,, 06, pp. 123 et seq.), and may be prepared by the action of nitrous fumes on a well-cooled solution of a salt of a primary amine, C 6 H 5 NH 2 HNO 3 HNO 2 = C 6 H 5 N 2 .NO 3 2H20, or, as is more usually the case (since the diazonium salts themselves are generally used only in aqueous solution) by the addition of a well-cooled solution of potassium or sodium nitrite to a well-cooled dilute acid solution of the primary amine.
Similarly phosphorous and hypophosphorous acids give phosphoric acid and phosphene, whilst nitrous acid gives nitric acid and nitric oxide: 4H3P03=3H3P04+PH3; 2H 3 PO 2 =H 3 PO 4 +PH 3 i 3HN02= HNO 3 +2NO--H20.
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