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Gravimetric Estimation of Nickel
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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 .

 

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

 

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