Category: 3rd Year

Separation of Copper and Estimation of Nickel Gravimetrically as Nickel dimethylglyoximate

Estimation of Ni from the mixture of Ni2+ and Cu2+ solution Procedure Pipette 25 mL given solution quantitatively into a 200 or 250 mL beaker. Acidify the solution with 1-2 mL of conc. HCl, warm the solution and pass H2S carefully to precipitate copper sulfide (black ppt.) completely. Remove H2S by boiling the solution gently (test with lead acetate paper). Cool the solution to 70-800C. Add 30-35 mL of dimethylglyoxime(dmg)…

Separation of Copper as CuS and Estimation of Zinc Gravimetrically as ZnNH4PO4

Estimation of Zn from the mixture of Zn and Cu solution Procedure: Transfer 25 mL of, supplied solution with a pipette into a 250 mL beaker.  Acidify the solution with 1-2 mL of cone. HCl and warm the solution and then pass H2 S carefully to precipitate (ppt) copper sulphide completely.  Filter off the ppt and wash the ppt with water several times to remove the adhering Zn2+.  Collect the…

Nomenclature of Coordination Complexes

A coordination complex is a substance in which a metal atom or ion accepts electrons from (andthus associates with) a group of neutral molecules or anions called ligands. A complex can be an anion, a cation ion, or a neutral molecule. Coordination compounds are neutral substances (i.e.uncharged) in which at least one ion is present as a complex. Nomeclature of Co-ordination compounds Read the following steps carefully (don’t skip one)…

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