Hydrazinium Thiocyanate as Analytical Reagent for the Quantitative Estimation of Copper

5 Hydrazinium Thiocyanate as Analytical Reagent for the Quantitative Estimation of Copper 

The copper content in cupric compounds is usually determined by gravimetric analysis. In the conventional method, Cu is usually reduced to Cu by the addition of sulfurous acid, ammonium hydrogen sulfite, ascorbic acid, or ferrous sulfate. It is then precipitated as cuprous thiocyanate by the addition of ammonium thiocyanate and estimated gravimetrically. 

The use of N2H5SCN as an analytical reagent for the quantitative estimation of copper has been explored since it reduces cupric to cuprous ion and precipitates as cuprous thiocyanate in a single step [8]. The procedure is as follows A copper solution containing up to 0.3 g of copper is diluted to 150-200 ml in a 400-ml beaker. A 10% solution of 

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