1.

NO_(3)^(-)toNO_(2) (acid medium) E^(0)=0.790V NO_(3)^(-)toNH_(3)OH^(+) (acid medium) E^(0)=0.731V. At what pH, the above two will have same E value ? Assume the concentration of all other species NH_(3)OH^(+) except [H^(+)] to be unity.

Answer»


Solution :`overset(+5)(N)O_(3)^(-)+2H^(+)+e^(-)tooverset(+4)(N)O_(2)+H_(3)O,0.79"VOLT"`
`overset(+5)(N)O_(3)^(-)+8H^(+)+6e^(-)toNH_(3)OH^(+)+2H_(2)O,0.731"volt"`
`E=0.79-(0.0591)/(1)log((1)/([H^(+)]^(2)))=0.731-(0.591)/(6)log((1)/([H^(+)]^(8)))`
`0.059=0.059(2-(8)/(6))pHimpliespH=(6)/(4)=1.5`


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