Abstract:

The calculation of chemical equilibrium in aqueous solution involves solving unary quadratic or multiple equations, which is troublesome. The initial concentration is used to substitute the equilibrium concentration for approximate calculation, however, sometimes, the error is large. In this article, the application conditions of the method of progressive approximation in the calculation of chemical equilibrium of aqueous solution are described, the number of approximations is predicted, and the steps of chemical equilibrium calculation in aqueous solution are put forward. This enables the calculation of chemical equilibrium in aqueous solution, especially in the case of unitary higher-order equations, to achieve the desired accuracy through some simple calculations without using computers, and reduce blindness by predicting approximation times.

Key words: Chemical equilibrium calculation, Method of successive approximation, Approximate calculation, Error, Predicted approximation times