Question 370: Current Electricity

Question

The nagative $$Zn$$ pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by $$0.13g$$ in $$30$$ minutes. If the electrochemical equivalent of $$Zn$$ and $$Cu$$ are $$32.5$$ and $$31.5$$ respectively, the increase in the mass of the positive $$Cu$$ pole in this time is

Accepted Answer

According to Faraday's first law of electrolysis $$m = z 	imes q$$
For same $$q,$$ $$\,\,\,\,\,\,\,\,\,$$ $$m \propto Z$$
$$	herefore$$ $${{{m_{Cn}}} \over {{m_{Zn}}}} = {{{Z_{Cu}}} \over {{Z_{Zn}}}}$$
$$ \Rightarrow {m_{Cu}} = {{{Z_{Cu}}} \over {{Z_{Zn}}}} 	imes {m_{Zn}}$$
$$ = {{31.5} \over {32.5}} 	imes 0.13 = 0.126\,g$$

Answer

$$0.180$$ $$g$$

Answer

$$0.141$$ $$g$$

Answer

$$0.126$$ $$g$$

Answer

$$0.242$$ $$g$$

Current Electricity

The nagative $Zn pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu$ pole in this time is

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