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The most pupular electrochemical cell, d...


The most pupular electrochemical cell, daniel cell was originally developed by the English chemist john F daniel the general assembly of the cell is as given below An undergraduate student made a Daniel cell using `100cm^(3)` of `0.100MCuSO_(4)` ad `0.100M` `ZnSO_(4)` solution respectively. The two compartments are connected by suitable salt bridge.
[given `E_((Cu^(2+)//Cu))^(@)=0.34V,E_((Zn^(2+)//Zn))=-0.76V,(2.30RT)/(F)=0.06,log2=0.3]`
Q. A labmate of the student asked her for some solid `CuCl_(2)`. while she was lifting the bottle from a shelf, the lid of the bottle slipped and some amount of `CuCl_(2)` fell in the `CuSO_(4)` compartment at constant volume. She measured the emf of the cell again and found that it has increase by 9 mV. She used this data to calculate the amount of `CuCl_(2)` that had spilled in the compartment. Calculate the mass of `CuCl_(2)` that had spilled into the daniel cell? (molar mass of `CuCl_(2)=135(g)/(mol))`

A

`1.35g`

B

`13.5g`

C

`27g`

D

`2.7g`

Text Solution

Verified by Experts

The correct Answer is:
A
`1.109=1.100-(0.06)/(2)log(0.1)/([Cu^(2+)])`
`[Cu^(2+)]=0.2M`
`Deltan=0.2xx0.1-0.1xx0.1`
`=0.01`
`w=0.01xx135=1.35` gm
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