4.1 The standard equilibrium constant 4.1.1 The basic features of a chemical equilibrium 4.1.2 The standard equilibrium constant expression 4.1.3 Experimental measurement of the standard equilibrium constant§4.1 The standard equilibrium constant 4.1.3 Experimental measurement of the standard equilibrium constant 4.1.2 The standard equilibrium constant expression 4.1.1 The basic features of a chemical equilibrium