Question

$2.47g$ of $CuO$ was obtained by oxidising $1.986g$ of copper by nitric acid. $0.335g$ copper was precipitated by $0.346g$ of zinc from ${CuSO}_4$ solution. What are the equivalent weight of copper and zinc respectively:

Answer 1

Equivalent mass of $Cu=\frac{MassofMetal\times 8}{Massofoxygeninoxide}$ Given

$=\frac{1.986}{(2.47-1.986)}\times 8=32.82$ $M_{Cuo}=2.47g$

$M_{Cu}=1.986g$

Now, $\frac{MassofZn}{MassofCu}=\frac{Eq.massofZn}{Eq.massofCu}$

$\frac{0.346}{0.335}=\frac{E_{Zn}}{32.82}$

$\therefore$ Eq. mass of $Zn=33.89$