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Titration of 0.2121g of pure Na2CO4(134g...

Titration of 0.2121g of pure `Na_2C_O_4(134g mol^-1)` require 43.31 ml of `KMnO_4` solution. What is the molarity of `KMnO_4` solution ?
`2MnO_4^-+5C_2O_4^-- +16H^+rarr2Mn^++ +10CO_2+8H_2O`

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