Question

Why is voltammetry advantageous over other methods of electroanalysis (coulometry and potentiometry)? What are the advantages and disadvantages of other methods? What method of (cyclic linear sweep, square wave, normal pulse) voltammetry should be used for studying a redox reaction?

Answer 1

s Advantages of volumetric analysis over other methods of electroandysi's are ase follows 1 Volumetric analysis is a process used to determine the amount of a desired constituent by its volume. 2 Volume of the analyte is determined 3) This method is usually faster and more convenient than gravimetric analysis. 4) It involves the preparation storage and measurement of volume of chemicals for analysis Advantages of coulometry and potentiometry. a Coulometry- @ the preparation of standard solution and titer determination is of course no log longer necessary 2) Chemical substances that are unstable or difficult to handle to handle because of their high volatility or reactivity in solution can also very easily be used as titrant b) potentiometry - 1) The method can be used to carry out the titrations for which visual indicator is. not available. 2) The method can be employed for the andlysis of dilute as well as coloured soluto 3) Weak acid - weak base and redox titrations can be performed without using externa

indicator " Disadvantages - & other process than volumetric analysis, je potentiometric and coulometry and other than this two method has disadvantanges. as follows 1) Potentiometry is can not be used in presence of oxidizing, reducing agents. 2) It can not be used in presence of - complexing agents. 3) It can not be used in presence of noble metals which will be displaced by antimony 4) Difficult to ensure 100% carrent efficiency need long time in coulometry titration. I Redox in redox processes the reactant transter- s elections to the oxidant. Thus, in the reaction, the reductant or reducing agent losses elections and is oxidised > Redox titration is a type of titration based on a redox reaction between the analyte and titant Redox titration may involves the use of a redox indicator and a potentiometer. eg- Redox titration is treating a sol" of iodine with a reducing indicator agent to produce lodide using a starch indicator to help detect the endpoint