Electro-chemistry

Metal-metal ion electrode in Half-Cells A half cell is one of the two electrodes in a galvanic cell or simple battery. For example, in the…

Half-Cells A half cell is one of the two electrodes in a galvanic cell or simple battery. For example, in the Zn-Cu battery, the two…

Measurement of E.M.F of Electrochemical Cells When current is drawn from a cell its e.m.f. gradually drops as chemical energy is being converted into electrical…

Weston Standard Cell The accuracy of measurement of e.m.f of a cell by the Poggendorf method depends on the constancy of the potential of the…

The origin of E.M.F. at metal Solution Interface Mention has been made of the potential difference between the electrodes. The question one may ask is:…

Reversible and Irreversible Cells A Galvanic cell always has two electrodes in which there is a difference in the tendency to give up electrons. The…

Galvanic Cells An electrochemical cell is an arrangement in which electric energy is released by a spontaneous redox reaction. This kind of cell is also…

Definition: The electron gain (or electron affinity) (ΔH0eg) is the energy change when one electron is added to each atom to form a negative ion.…

Sometimes the value for the bond dissociation enthalpy is instead given. Note that this bond dissociation enthalpy refers to one bond, so is double the…

Standard enthalpy of formation (ΔH0f) Definition: One mole of the compound is formed from its elements in their standard states. For example, sodium chloride (NaCl)…