A laboratory technician is determining the enthalpy of neutralisation by reacting dilute hydrochloric acid with sodium hydroxide solution in a polystyrene cup calorimeter.
Identify one manual technique the technician should carry out on the reaction mixture during the process to ensure that the temperature distribution is completely uniform before recording the temperature.
94 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.