The addition of dimethylglyoxime, H2C4H6O2N2, to a solution containing nickel(II) ion gives rise to a precipitate:
Ni2+ + 2H2C4H6O2N2 →2H+ + Ni(HC4H6O2N2)2
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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