1. Tardigrade
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  3. Chemistry
  4. Write the name of reagent to identify Co2+.

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Q. Write the name of reagent to identify $ C{{o}^{2+}}. $

CMC MedicalCMC Medical 2015

Solution:

$ N{{H}_{4}}CNS $ is the reagent used to identify $ C{{o}^{2+}}. $ $ CoC{{l}_{2}}+4N{{H}_{4}}SCN\xrightarrow{{}} $ $ \underset{Blue\,\,colour}{\mathop{{{(N{{H}_{4}})}_{2}}[Co{{(SCN)}_{4}}]}}\,+2N{{H}_{4}}Cl $ $ N{{H}_{4}}CNS $ can be used to make distinction between $ C{{u}^{2+}} $ and $ C{{o}^{2+}} $ . $ CuC{{l}_{2}}+2N{{H}_{4}}SCN\xrightarrow{{}}\underset{Black\,ppt.}{\mathop{Cu{{(SCN)}_{2}}}}\,\downarrow +2N{{H}_{4}}Cl $