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The questions are for an experiment called Gravimetric Determination of Nickel in An Unknown Solution.Thank you...

The questions are for an experiment called Gravimetric Determination of Nickel in An Unknown Solution.Thank you for your time and work!

1) What is the importance of pH control in the determination of nickel by gravimetry?

2)Why do we perform chloride test? I know that we used AgNO3.

3)Write the chelation reaction between nickel and DMG and how does the chelation reaction occur? Explain.

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Answer #1

1) Ni2+ + 2DMG Ni(DMG)2 + 2H+

If the pH becomes too low, then the above equilibrium favors the formation of the Ni2+ ion. Hence, pH control is important in the determination of nickel by gravimetry.

2) AgNO3(aq) + Cl-(aq) AgCl(s) + NO3-(aq)

The chloride test is performed to precipitate silver as silver chloride.

3) The chelation occurs between 2 N-atoms (but not oxygens) of DMG ligand and nickel because of hard (Ni2+)-hard (N) interaction, as shown below.

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