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CGP EDU Academic Team
Published on: August 14, 2026
The K sp of FeS = 4 x 10 -19 at 298 K. The minimum concentration of H + ions required to prevent the precipitation of FeS from a 0.01 M solution Fe 2+ salt by passing H 2 S (Given H 2 S k a1 x k b1 = 10 -21 )
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Verified by ExpertsThe correct answer is:
A
1.6 x 10 -3 M
[Fe 2+ l [S -2 1 = 4 x 10 -19 
[S -2 1 = 
= 4 x 10 -17 M
In order to precipitate FeS, [S -2 ] required is 4 x 10 -17 M from 0.01 M Fe 2+ salts.
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