Question

Metallic tin in the presence of $HCl$ is oxidized by $K_{2}C{r}_2{O}_7$ solution to stannic chloride. What volume of decinormal dichromate solution would be reduced by $1g$ of $Sn$?

Answer 1

We have, the redox changes

as,

$Sn\to S{n}^{4+}+4e^{-}$

$6e^{-}+C{r}_2^{6+}\to 2C{r}^{3+}$

$\therefore$ Meq of Sn = Meq of $K_{2}C{r}_2{O}_7$

or $\frac{1}{E_{sn}}\times 1000=\frac{1}{10}\times v$

or $\frac{1}{118.7/4}\times 1000=\frac{1}{10}\times v$

[As Equivalent means of $S_n$

$=st.wt/4$]

or $v=336.98ml$