Redox titration using salt thiosulphate being a reducing agent is also referred to as iodometric titration. The reaction is usually: - I2(aq) + 2NA2S2O3(aq) 2Nal(aq) & 2Na2S4O6(aq)
I2(aq) + 2S2O32-(aq)2I-(aq) + S4O62-(aq)
In this equation, I2 has become reduced to I-:
2S2O32-(aq)S4O62-(aq) + 2e-
I2(aq) & 2e- 2I-(aq)
The iodine/ thiosulphate titration is a general method for identifying the attentiveness of oxidizing solution. A known volume of an oxidizing agent is usually added into an excess remedy of acidified potassium iodide. The reaction is going to release iodine: -
a. With KMnO4
2MnO4-(aq) + 16H+ (aq)+ 10I-(aq) 2Mn2+(aq) & 5I2(aq) + 8H2O(I)
b. With KIO3
O3-(aq) + 5I-(aq) + 6H (aq) 3I2(aq) & 3H2O(aq)
The iodine that is released can be titrated having a standard thiosulphate solution. Through the stoichiometry in the reaction, how much iodine can be discovered and using this the concentration of the oxidizing agent, which released the iodine, could be calculated....
#6 Determination of Percent Hypochlorite in Clorox by Redox TitrationFall 2005 1
Try things out 6 - Redox Titration
The right way to prepare a remedy of principal standard using a volumetric flask 2 .
How to make burets intended for titration3.
How to titrate a sample
Be able to compare and contrast a redox equation (or reaction) and a precipitationequation (or reaction)2.
Be able to write the whole ionic equation for any reaction, especially redox3.
Have the ability to balance a redox equation4.
Be able to discover the decrease half response and the oxidation half reaction5.
Be able to identify the reducing and oxidizing agent in a redox reaction (given the 1 / 2 reactions)6.
Be able to compare stoichiometric level and endpoint7.
Have the ability to compare and contrast titrant and analyte8.
Be able to compare and contrast a standardization titration having a...