The Ksp of nickel sulfide is 4.0 x 10^-20. What is the concentration of sulfide ion in a saturated solution of nickel sulfide? Chemistry The Ksp of nickel sulfide is 4.0 x 10^-20. What is the concentration of sulfide ion in a saturated solution of nickel sulfide?Answer: 2.0 x 10^-10 M Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+