10–200g/L) solutions were reacted with copper metal at temperatures between 50 and 95°
C to form Cu+ until equilibrium was attained. Samples were collected into an NH4Fe (SO4)
2· 12H2O solution to convert cuprous to ferrous, which were then titrated with standard Ce
(IV) using very dilute ferroin as the indicator. In order to estimate solution compositions in
volumetric units (eg g/L) the densities of the parent CuSO4–H2SO4 solutions at the reaction …