Problem: What is the solubility in moles/liter for copper(II) sulfide at 25 °C given a Ksp value of 1.3 x 10-36. Write using scientific notation and use 1 or 2 decimal places (even though this is strictly incorrect!)

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For this problem, we’re being asked to calculate the solubility in moles/liter for copper(II) sulfide at 25 °C given a Ksp value of 1.3 x 10-36


Since the CuS is an ionic compound, it forms ions when dissociating in water. The dissociation of CuS in water is as follows:


The Sulfide ion, S2, has a charge of –2. Copper then has a charge of +2:

CuS(s)  Cu2+(aq) + S2(aq)



We can construct an ICE table for the dissociation of CuS

Remember that solids are ignored in the ICE table and Ksp expression.


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Problem Details

What is the solubility in moles/liter for copper(II) sulfide at 25 °C given a Ksp value of 1.3 x 10-36. Write using scientific notation and use 1 or 2 decimal places (even though this is strictly incorrect!)

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Ksp concept. You can view video lessons to learn Ksp. Or if you need more Ksp practice, you can also practice Ksp practice problems.