6. The amount of nickel (FM 58.693) in steel can be determined with the precipitating agent dimethylglyoxime (DMG, C4H8O2N2, FM 116.12). The steel is dissolved in acid, the solution is neutralized, then the DMG is added to precipitate the nickel as the complex bis(dimethylglyoximate)nickel(II) (Ni(C4H7O2N2)2, FM 288.91) according to this reaction: Ni2+(aq) + 2C4H8O2N2(aq) → Ni(C4H7O2N2)2(s) + 2H+(aq) DMG has limited solubility in water and may precipitate with the complex, so it is important to avoid adding an excess of the precipitating agent. a) If the mass percent of nickel in a certain steel sample is believed to be approximately 2.0%, what volume of 1.0 wt% dimethylglyoxime solution with a density of 0.83 g/mL should be used with a 1.5-g steel sample to give a 25% excess of DMG? b) If a 1.458 9-g sample of steel produced 0.150 6 g of precipitate, what was the mass percent of nickel in the sample?
Atomic Structure
The basic structure of an atom is defined as the component-level of atomic structure of an atom. Precisely speaking an atom consists of three major subatomic particles which are protons, neutrons, and electrons. Many theories have been stated for explaining the structure of an atom.
Shape of the D Orbital
Shapes of orbitals are an approximate representation of boundaries in space for finding electrons occupied in that respective orbital. D orbitals are known to have a clover leaf shape or dumbbell inside where electrons can be found.
6. The amount of nickel (FM 58.693) in steel can be determined with the precipitating agent
dimethylglyoxime (DMG, C4H8O2N2, FM 116.12). The steel is dissolved in acid, the solution is
neutralized, then the DMG is added to precipitate the nickel as the complex
bis(dimethylglyoximate)nickel(II) (Ni(C4H7O2N2)2, FM 288.91) according to this reaction:
Ni2+(aq) + 2C4H8O2N2(aq) → Ni(C4H7O2N2)2(s) + 2H+(aq)
DMG has limited solubility in water and may precipitate with the complex, so it is important to avoid
adding an excess of the precipitating agent.
a) If the mass percent of nickel in a certain steel sample is believed to be approximately 2.0%, what
volume of 1.0 wt% dimethylglyoxime solution with a density of 0.83 g/mL should be used with a
1.5-g steel sample to give a 25% excess of DMG?
b) If a 1.458 9-g sample of steel produced 0.150 6 g of precipitate, what was the mass percent of
nickel in the sample?
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