Electro Chemistry

Corrosion When metals are exposed to atmospheric conditions, they react with air or water in the environment to form undesirable compounds (usually oxides). This process is called corrosion. The least active metals such as gold, platinum and palladium are attacked by environment. For example: Silver tarnishes, copper develops a green coating, lead or stainless steel lose … [Read more...] about Corrosion

Electrochemical cell vs Electrolytic cell Electrochemical cell Electrolytic cell It is a device which converts chemical energy into electrical energy. It is a device which converts electrical energy into chemical energy. The redox reaction is spontaneous and is responsible for the production of electrical energy. The redox reaction is non-spontaneous and … [Read more...] about Batteries

Products of Electrolysis During electrolysis, the reactions occurring at the electrodes are oxidation and reduction reactions. The products of electrolysis depend on the nature of material being electrolysed and the types of electrodes being used.If the electrode is inert such as gold or platinum, it does not take part in the chemical reaction and acts only as a source or sink … [Read more...] about Products of Electrolysis

Electrolytic cells Electrolysis is a process in which chemical changes take place by the passage of electric current. The cells used to carry out electrolysis are electrolytic cells Process of electrolysis 1) The process of electrolysis is carried out by taking the solution of an electrolyte in a suitable vessel. The vessel is called electrolytic tank. 2) It is made … [Read more...] about Electrolytic Cells

Nernst Equation The standard electrode potentials are measured in their standard states when the concentration of the electrolyte solutions are fixed as 1M and temperature is 298 K. In actual practice electrochemical cells do not have always fixed concentration of the electrolyte solutions. The electrode potentials depend on the concentration of the electrolyte solutions. … [Read more...] about Nernst Equation

Electrochemical Series The arrangement of elements in order of increasing electrode potential values is called  electrochemical series.The electrochemical series also called activity series. Applications of the Electrochemical Series The main applications of the electrochemical series are: 1) Relative Strengths of Oxidising and Reducing Agents In the electrochemical … [Read more...] about Electrochemical Series

Electrode Potential The flow of electric current in an electrochemical cell indicates that a potential difference exists between two electrodes. When an electrode say copper, is immersed in a solution of its ions, then either of the following three possibilities can take place: a) The metal ions (Cu2+) may collide with the electrode and do not undergo any change. b) … [Read more...] about Electrode Potential and E.M.F. of a Galvanic Cell

Electrochemical Cells The chemical changes which involve the flow of electric current are called electrochemical changes. These are broadly of two types: 1) Electrochemical cells or Galvanic cells These constitute the electrochemical reactions in which chemical energy is converted to electrical energy. In these cells, spontaneous redox reaction is used to generate an … [Read more...] about Electrochemical Cells

Variation of Conductivity and Molar conductivity with conductivity Electrolytic conductance decreases with increase in  concentration or increases with increase in dilution. This is because conductance of ions is due to the presence of ions in the solution. The greater the number of ions, the greater is the conductance.As with dilution, more ions are produced in solution so … [Read more...] about Variation of Conductivity and Molar Conductivity

Electrolytic Conduction When a voltage is applied to the electrodes dipped into an electrolytic solution, ions of the electrolyte move and, therefore, electric current flows through the electrolytic solution. The power of the electrolytes to conduct electric current is termed conductance or conductivity. Electrolytic solutions also obey Ohm's law. Ohm's Law This law … [Read more...] about Electrolytic Conduction