why we have to burn oxalic acid in titration with KMnO4....???
Answers
Answered by
0
Oxalic acid is easily crystallized, purified, and dried, giving the chemist reasonable assurance that 1g of oxalic acid is, in fact, 1g. If it oxidizes, it evaporates as CO2, and if it gets wet, it can be dried, so as purified crystals of oxalic acid “age” they doesn’t lose purity, per se, only mass, in a drying oven.
Permanganate, on the other hand, is subject to countless opportunities to become impure, and therefore 1g isn’t typically 1 pure gram, but some fraction thereof. Since permanganate and oxalic acid react irreversibly and autocatalytically to form carbon dioxide, and because the oxidation is cleanly observable in the visible spectrum of light (using inexpensive student lab equipment such as the Spec-20), it makes for an ideal demonstration of the various techniques needed to perform a fairly accurate chemical experiment.
By using titration to quantify various standards (such as normality of acids and bases, stock solutions, and reagents) a chemist doesn’t simply rely on a number written on a bottle, but proves every number through repeated checking, and reduces the opportunities that they may have fooled themselves (or, more rarely, had a practical joke pulled on them at their expense).
Permanganate, on the other hand, is subject to countless opportunities to become impure, and therefore 1g isn’t typically 1 pure gram, but some fraction thereof. Since permanganate and oxalic acid react irreversibly and autocatalytically to form carbon dioxide, and because the oxidation is cleanly observable in the visible spectrum of light (using inexpensive student lab equipment such as the Spec-20), it makes for an ideal demonstration of the various techniques needed to perform a fairly accurate chemical experiment.
By using titration to quantify various standards (such as normality of acids and bases, stock solutions, and reagents) a chemist doesn’t simply rely on a number written on a bottle, but proves every number through repeated checking, and reduces the opportunities that they may have fooled themselves (or, more rarely, had a practical joke pulled on them at their expense).
Similar questions