Walden reductor

Walden reductor a reduction column using granular Ag as a reducing agent, (p. 341)... 

Why don t Cr3+ and TiOz+ interfere in the analysis of Fe3+ when a Walden reductor, instead of a Jones reductor, is used for prereduction ... 

Walden reductor A column packed with silver and eluted with HC1. Analyte is reduced during passage through the column. The reduced product is titrated with an oxidizing agent. 

The silver reductor, often called the Walden reductor, is much more selective than zinc as a reducing agent. A hydrochloric acid solution is always used. The electrode potential varies with the concentration of chloride therefore the acid concentration is more critical than with the zinc reductor. From... 

Table 20-1 lists the principal applications of the Jones reductor. Also listed in this table are reductions that can be accomplished with a Walden reductor, in... 

Why is a Walden reductor always used with solutions that contain appreciable concentrations of HCl ... 

Write a balanced net ionic equation for the reduction of in a Walden reductor. 

Walden reductor A column packed with finely divided silver granules used to prereduce analytes. 

The mercury(l) chloride is unaffected by oxidants during the subsequent titration. Sulfite (or SO2) and hydrogen sulfide are alternative reductants. Metals may also be used. Small pieces of metal (zinc - a Jones reductor, silver - a Walden reductor) are used to fill a column, through which the analyte solution is passed. The effluent is titrated with oxidant. A comparison of the reduction products of the two reductor columns is given in Table 3. 

Only in the presence of Cl ion is Ag a sufficiently good reducing agent to be very useful for prereductions. In the presence of Cl the half-reaction occurring in the Walden reductor is... 

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