Home
Class 12
CHEMISTRY
For Cr(2)O(7)^(2-)(aq)+14H^(+)(aq)+6e^(-...

For `Cr_(2)O_(7)^(2-)(aq)+14H^(+)(aq)+6e^(-) to 2Cr^(3+)(aq)+7H_(2)O(aq)`
`E^(@)=1.33" V". At [Cr_(2)O_(7)^(2-)]=4.5" millimole" , [Cr^(3+)]=15" millimole", E is 1.067" V"`. The pH of the solution is :

Text Solution

Verified by Experts

`-E_(cell)=-((772xx1000" CV "mol^(-1)))/((4)xx(96500" C " mol^(-1)))=2V` ltbr? For the given reaction :
`Cr_(2)O_(7)^(2-)(aq)+14H^(+)(aq)+6e^(-) to 2Cr^(3+)(aq)+7H_(2)O(aq)`
`1.067=1.33-(0.0591)/(6)"log"([Cr^(3+)]^(2)[H_(2)O]^(7))/([Cr_(2)O_(7)^(2-)][H^(+)]^(14))`
`1.067=1.33-9.85xx10^(-3)"log"((15xx10^(-3))^(2)xx(1)^(7))/((4.5xx10^(-3))[H^(+)]^(14))`
`2 log[15xx10^(-3)]-log[4.5xx10^(-3)]-14" log "[H^(+)]=(0.263)/(9.85xx10^(-3))`
`2xx(-1.82)+2.34+14 pH=26.7`b
`14 pH=26.7+1.3=28`
`pH=(28)/(14)=2`.
Promotional Banner

Topper's Solved these Questions

  • ALCOHOLS AND PHENOLS

    DINESH PUBLICATION|Exercise COMPLETION QUESTION|2 Videos

  • ALCOHOLS AND PHENOLS

    DINESH PUBLICATION|Exercise NCERT In-Text Questions|9 Videos

  • ALDEHYDES AND KETONES

    DINESH PUBLICATION|Exercise Interger|5 Videos

Similar Questions

Explore conceptually related problems

For Cr_(2)O_(7)^(2)+14 H^(+)+6e^(-)rarr2Cr^(3+)+7H_(2)O E^(@)=1.33 V.At 298 k, [Cr_(2)O_(7)^(2-)] =4.5 millimole [Cr^(3+)]=15 millimole ,E is 1.067 v The pH of the solution is nearly eual to

Cr_(2)O_(7)^(2-)+H^(+)+SO_(3)^(2-) to Cr^(3+)(aq.)+SO_(4)^(2-)

Fe^(2+)(aq.)+Cr_(2)O_(7)^(2-)+H^(+) to Fe^(3+)(aq.)+Cr^(3+)

The electrode with reaction :Cr_(2)O_(7)^(2-)(aq)+14H^(o+)(aq)+6e^(-) rarr 2Cr^(3+)(aq)+7H_(2)O can be represented as

Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox titration. Some half cell reaction and their standard potentials are given below: MnO_(4)^(-)(aq) +8H^(+)(aq) +5e^(-) rarr Mn^(2+)(aq) +4H_(2)O(l) E^(@) = 1.51V Cr_(2)O_(7)^(2-)(aq) +14H^(+) (aq) +6e^(-) rarr 2Cr^(3+)(aq) +7H_(2)O(l), E^(@) = 1.38V Fe^(3+) (aq) +e^(-) rarr Fe^(2+) (aq), E^(@) = 0.77V CI_(2)(g) +2e^(-) rarr 2CI^(-)(aq), E^(@) = 1.40V Identify the only incorrect statement regarding quantitative estimation of aqueous Fe(NO_(3))_(2)