Question

Give one chemical test each to distinguish between the following pairs of compounds :-



ii) Ferric chloride and Cuperic chloride.​

Answer 1

we can use lead for distinguished between Ferric chloride and Cuperic chloride .

explanation :-

• lead is less reactive than iron and more reactive than copper so In the reaction lead will be react with solution of Cupric chloride but lead will not react with ferric chloride .

so we can distinguish with use of different elements like tin(Sn) , lead , copper .

hope its will help .

Answer 2

Ferric chloride

(FeCl3) has widespread use as an etchant in the PCB industry and for photochemical machining. Although the corrosion process of copper in FeCl3 is well known, the use of organic inhibitors of copper corrosion in FeCl3 solutions has not been reported. Such inhibition may allow microfabrication of special PCB designs and electrochemical sensors. Here, we investigate the inhibition of copper corrosion by FeCl3 (0.10 or 2.46 M) solutions with organic inhibitors. The most promising inhibitors are identified, investigated in 0.01 M FeCl3 solution using electrochemical techniques at different temperatures and exposure times, and the modified surfaces of copper are characterized by a variety of techniques in order to determine the inhibition mechanism. 5-methyl-1H-benzotriazole (MBTA, 65 mM) and 1H-benzotriazole (BTA, 65 mM) are found to be the most attractive inhibitors, with inhibition efficiencies between 96.5% and 99.5% at room temperature, depending on the exposure time and the measurement technique.

Cuperic chloride.

• Copper(II) chloride is the chemical compound with the chemical formula CuCl₂. The anhydrous form is yellowish brown but slowly absorbs moisture to form a blue-green dihydrate. Both the anhydrous and the dihydrate forms occur naturally as the very rare minerals tolbachite and eriochalcite, respectively.