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because it easily ionises itself.
kmno4 is very good oxidizing agent. that means it is easily reduced by any other reagent. so it can't be considered as primary standard as its concentration changes upon free leaving
Potassium permanganate solutions due to the strong oxiding nature readily forms MnO2 on contact with impurities. Traditionally sources of KMnO4 always contained traces of MnO2 . KMnO4 solutions "go off" when they stand for a period.
Dissolve a known amount of potassium permanganate in a known volume of demineralized water; calculate the concentration of manganese in the solution.
aqueous solutions are not stable for long
for preparing 0.1 normal solution of potassium permanganate you have to disssolve 3.16 g potssium permangnate in 1L water bt in alkaline or neutral medium reactions of potassium permanganate is different and Mn gains 3 electrons in redox reaction,so far alkaline medium redox titration equivalent wt of KMnO4 will be 158\3=52.6.so far,0.1 N KMnO4 in alkaline medium redox titration dissolve 5.26 g in 1L sol.
the group number in standard and roman numerals of potassium is as follows .the group number in standard of potassium is Group 1 .the group number roman numerals of potassium is Group I.
sodium hydroxide is a secondary standard because it absorb the moisture from the air and its concentration will change
The standard enthalpy of formation for potassium hydroxide is -425,8 kJ/mol.
At standard temperature and pressure, potassium is a solid.
one is specific
HCl is not used as a primary standard