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In the reaction 2CuSO(4)+4KI rarr 2Cu(...

In the reaction
`2CuSO_(4)+4KI rarr 2Cu_(2)I_(2)+I_(2)+2K_(2)SO_(4)` the equivalent weight of `CuSO_(4)` will be:

A

79.75

B

159.5

C

329

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`2CuSO_(4)+4KIrarrCu_(2)I_(2)+I_(2)+2K_(2)SO_(4)`.
`Cu^(2+)+1e^(-)rarrCu^(+)`.
`E_(cu)=?. V.f.=1`.
`E_(cuSO_(4))=(159.5)/(1)=159.5`
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Direct titration of I_(2) with a reducing agent is called iodimetry. If I_(2) is leberated by the oxidation of I_(ɵ) ion by a strong oxidising agent in neutral or acidic medium, the liberated I_(2) is then titrated with reducing agent. Iodometry is used to estimate the strngth of the oxidising agent. For example, in the estimation of Cu^(2+) with S_(2)O_(3)^(2-) Cu^(2+)+I^(ɵ)toCuI_(2)+I_(2) (iodometry) I_(2)+S_(2)O_(3)^(2-)toS_(4)O_(6)^(2-)+I^(ɵ) (iodimetry) Strach is used as an indicator at the end point, which forms bluecoloured complex with I_(3)^(ɵ) Disappearance of blue colourindicates the end point whe free I_(2) in not present. Q. In the reaction 2CuSO_(4)+4KItoCu_(2)I_(2)+2K_(2)SO_(4)+I_(2) The equivalent weight of CuSO_(4) is (Mw=159.5g mol^(-1))

2KI+CuSO_(4) to CuI darr+(1)/(2)I_(2)+K_(2)SO_(4)

CuSO_(4)+2KI to CuI darr+(1)/(2)I_(2)+K_(2)SO_(4)

Cu_(2)S+MnO_(4)^(ө)rarrCu^(2+)+Mn^(2+)+SO_(2) The equivalent weight of Cu_(2) is

CuSO_(4)+2KCN to CuCN darr+(CN)_(2)uarr+K_(2)SO_(4)

RESONANCE-EQUIVALENT CONCEPT & TITRATIONS-APSP (Part-I)
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