The addition of dimethylglyoxime, H₂C₄H₆O₂N₂, to a solution containing nickel(II) ion gives rise to a precipitate:

Nickel dimethylglyoxime is a bulky precipitate that is inconvenient to manipulate in amounts greater than 175 mg. The amount of nickel in a type of permanent-magnet alloy ranges between 24% and 35%. Calculate the sample size that should not be exceeded when analyzing these alloys for nickel.

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Ni²+ + 2H2C,H,O2N2→ 2H* + Ni(HC,H,O,N2)2