Problem: For each pair of compounds, use Ksp values to determine which has the greater molar solubility.Ni(OH)2 or NiCO3

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We’re being asked to determine which compound has the greater molar solubility using their Ksp values.


Recall that Ksp is an equilibrium constant related to slightly soluble ionic compounds


Since Ni(OH)2 is an ionic compound, it forms ions when dissociating in water. The dissociation of Ni(OH)2 in water is as follows:


The hydroxide ion, OH, has a charge of –1. Nickel then has a charge of +2:


Ni(OH)2(s)  Ni2+(aq) + 2 OH- (aq)


Since NiCO3 is also an ionic compound, it forms ions when dissociating in water. The dissociation of NiCOin water is as follows:


The hydroxide ion,CO32, has a charge of –2. Nickel then has a charge of +2:


NiCO3(s)  Ni2+(aq) + CO32 (aq)


We can construct an ICE table for the dissociation of each compound. Remember that solids are ignored in the ICE table and Ksp expression.

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Problem Details

For each pair of compounds, use Ksp values to determine which has the greater molar solubility.

Ni(OH)2 or NiCO3

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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.