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Property Name Property Value Reference; Molecular Weight: 290.93 g/mol: Computed by PubChem 2.1 (PubChem release 2019.06.18) Hydrogen Bond Donor Count. DmgH 2 is used in the analysis of palladium or nickel. Its coordination complexes are of theoretical interest as models for enzymes and as catalysts. Many related ligands can be prepared from other diketones, e.g. Dimethylglyoxime can be prepared from butanone first by reaction with ethyl nitrite to give biacetyl monoxime. Oct 07, 2009  Hello, I would really appreciate some help. I had to do a gravimetric analysis of Nickel in Ore. My question is, how can I determine the percent by mass of the Nickel having only the mass of the Nickel complex (Ni(DMGH2) and the ore mass? I don't know how to find the mass of only the Nickel from the Nickel complex. If anyone knows, please help!!! The reaction is performed in a solution buffered by either an ammonia or citrate buffer to prevent the pH of the solution from falling below 5. If the pH does become too low the equilibrium of the above reaction favors the formation of the nickel (II) ion, causing the dissolution of Ni (DMG) 2.

• Ni(dmg)2 Reaction
• Ni Dmg 2 2+ Reaction 2
• Ni Dmg 2 2+ Reactions
• Ni Dmg 2 2+ Reaction Video

The number of electrons in each of nickel's shells is 2, 8, 16, 2 and its electron configuration is Ar3d 8 4s 2. Nickel was first discovered by Alex Constedt in 1751. The nickel atom has a radius of 124 pm and a Van der Waals radius of 184 pm. In its elemental form, nickel has a lustrous metallic silver appearance. The reaction is performed in a solution buffered by either an ammonia or citrate buffer to prevent the pH of the solution from falling below 5. If the pH does become too low the equilibrium of the above reaction favors the formation of the nickel(II) ion, causing the dissolution of Ni(DMG)2 back into the mother liquor.

2 Answers

Explanation:

#Ni + C_4H_8N_2O_2 -> Ni(C_4H_8N_2O_2)_2#
as there are 1 molecule nickel, 4 molecules of carbon, 8 molecules of hydrogen, 2 molecules of nitrogen, and 2 molecules of oxygen in left hand side
but 1 molecule of nickel, 8 molecules of carbon, 16 molecules of hydrogen, 4 molecules of nitrogen, and 4 molecules of oxygen
so, by multiplying #C_4H_8N_2O_2# by #2# the equation will be balanced.

#'Ni'_text((aq])^(2+) + 2'C'_4'H'_8'N'_2'O'_text(2(aq]) -> 'Ni'('C'_4'H'_7'N'_2'O'_2)_text(2(s]) darr + 2'H'_text((aq])^(+)#

Explanation:

The starting chemical equation given to you is actually incorrect.

This reaction takes place in aqueous solution and it involves the nickel(II) cation, #'Ni'^(2+)#, not nickel metal, #'Ni'#.

Reacting nickel(II) cations with dimethylglyoxime, #'C'_4'H'_8'N'_2'O'_2#, will produce an insolube solid called nickel dimethylglyoxime, #'Ni'('C'_4'H'_8'N'_2'O'_2)_2#, which will precipitate out of solution.

The nickel(II) cations can be delivered to the solution by a soluble salt like nickel(II) nitrate, #'Ni'('NO'_3)_2#.

The actual balanced chemical equation for this reaction can be written like this

#'Ni'_text((aq])^(2+) + 2'C'_4'H'_8'N'_2'O'_text(2(aq]) -> 'Ni'('C'_4'H'_7'N'_2'O'_2)_text(2(s]) darr + 2'H'_text((aq])^(+)#

Ni(dmg)2 Reaction

The reaction involves two dimethylglyoxime molecules acting as chelating agents to form the nickel dymethylglyoxime complex.

When the nickel(II) cations are delivered via nickel(II) nitrate, the reaction will produce

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Ni Dmg 2 2+ Reaction 2

#'Ni'('NO'_3)_text(2(aq]) + 2'C'_4'H'_8'N'_2'O'_text(2(aq]) -> 'Ni'('C'_4'H'_7'N'_2'O'_2)_text(2(s]) darr + 2'HNO'_text(3(aq])#

The nitrate anions, #'NO'_3^(-)#, are spectator ions in the reaction, meaning that they can be found on both sides of the chemical equation.

This reaction is used as a confirmation test for the presence of nickel(II) cations. Nickel dymethylglyoxime is a red precipitate.

Ni Dmg 2 2+ Reactions

Ni Dmg 2 2+ Reaction Video