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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` |
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Answer» Correct Answer - 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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