AbstractIt has been found that the two‐phase reactions of aqueous HCl, HOAc or H3PO4with primary amine N1923in chloroform are oscillating reactions. Their power‐time curves were measured by the titration microcalorimetric method, and the induction period (tta). The first oscillating period (tp.1) and the second oscillating period (tp.2) were determined. The apparent activating parameters and the orders of the oscillating systems were calculated and the following relationships were established: for the oscillating system of hydrochloric acid tin∞ c0.147HCIexp(1.35 × 103/T), tp.1∞ c0.241HCI, exp(4.33 × 103/T), tp.2∞ c0.290HCIexp(5.59 × 103/T); for the oscillating system of acetic acid, tin∞ c0.883HOAcexp(2.32 × 103/T), tp.1∞ c0.399BOAc, exp(4.50 × 103/T), tp.2∞ c0.301HOAcexp(5.88 × 103/T); for the oscillating system of phosphoric acid, tin∞ c1.14 H 3PO 4exp(7.70 × 104), tp.1∞ c1.42 H 3PO 4exp (1.14 × 104/T