Iron (III) hydroxide is the least soluble compound as it has the lowest Ksp value.
What is solubility of a solute?
The solubility is the amount of solute that can dissolve in a given volume of solvent at a particular temperature.
The solubility of substances can be compared using their their solubility products constant (Ksp) values.
Iron (III) hydroxide has the lowest Ksp value.
Therefore, Iron (III) hydroxide is the least soluble compound.
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