1.

In the standardization of Na_(2)S_(2)O_(3) using K_(2)Cr_(2)O_(7) by iodometry, the equivalent weight of K_(2)Cr_(2)O_(7) is ("molecular weight")/(X). What is the vlaue of X.

Answer»


Solution :`{:(Cr_(2)O_(7)^(2-)+14H^(+)+6e^(-)rarr2Cr^(3+)+7H_(2)O),(""2I^(-)RARR I_(2)+2e^(-)xx3),(bar(Cr_(2)O_(7)^(2-)+14H^(+)+6I^(-)rarr 2Cr^(3+)+3I_(2)+7H_(2)O)):}`
`"So. eq. wt. "=("Molecular w.t.")/(6)`


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