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

###### FREE Expert Solution

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