Experiment:- Preparation of Nickel-DMG complex from given resources.

Practical

B Sc- III

Experiment:- Prepare Nickel-DMG complex from given resources.

 




 Do watch this video, link given below for experment.

https://www.youtube.com/watch?v=peMyqdJ57dA

Requirements:- Chemical Required-NiSO4 or NiCl2.6H2O, Di-methyleglyoxime, Conc. NH3 , HCl. 

Apparatus-   Beaker (100ml, 50ml, 20ml), Thermometer, heating plate or water bath, conical funel, stand, distilled water, filter paper.

Theory:

 

Gravimetric analysis is one of the most accurate analytical methods available. It is concerned with the determination of a substance by the process of weighing. The element or radical to be determined is converted into a stable compound of definite composition and the mass of the compound is determined accurately. From this, the mass of element or radical is calculated.


Chemical Reaction

Objectives:

 

  • To precipitate nickel from the solution by adding dimethyl glyoxime.
  • Filtration of precipitate using sintered glass crucible.
  • Mass of nickel calculated from the mass of precipitate.

Procedure:

 

  • The given nickel solution is made up to 100mL in a standard measuring flask.
  • 20 mL of solution is pipetted into a 250 mL beaker.
  • About 5 mL 1:1 HCl is added and diluted to 150 mL.
  • The solution is heated to 70-80°C. 25 mL of 1% dimethyl glyoxime in alcohol is added, immediately followed by dilute ammonia solution drop wise until it strongly smells of ammonia.
  • The solution containing the precipitate is heated in a water bath for 30 minutes.
  • The precipitate is allowed to stand for an hour.
  • Filter the solution through a previously weighed sintered glass crucible.
  • The precipitate is washed with cold water to free chloride.
  • The crucible is placed in a dry 100 mL beaker and heated in the air oven at 110-120°C for 1 hour.
  • It is cooled in a desiccator and weighed. Repeat drying until constant weight is obtained.

 

Calculation:

 

Mass of sintered glass crucible = a g.

 

Mass of sintered glass crucible + nickel complex = b g.

 

Mass of dimethyl glyoxime nickel complex = (b-a) g.

 

288.69 of nickel complex contain 58.69 g of nickel.

 

Mass of nickel in (b-a) g of complex 

 

Result

Therefore, Mass of nickel in the whole of the given solution .


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