Nickel Oxide Solubility

Nickel oxide (NiO) is a sparingly soluble compound, meaning it has low solubility in water and other polar solvents. According to literature sources, the solubility of nickel oxide in water is approximately 5.6 x 10^-6 grams per liter at 25°C.

The solubility of nickel oxide can be affected by various factors such as pH, temperature, and the presence of other ions in solution. For example, the solubility of NiO increases with decreasing pH due to protonation of the oxide surface which makes it more soluble. Likewise, increasing temperature generally increases solubility as it provides more energy for the dissolution process to occur.

The solubility of nickel oxide can also be influenced by the presence of other ions in solution. For instance, the presence of carbonate or hydroxide ions can lead to the formation of soluble nickel complexes and increase nickel oxide solubility. On the other hand, the presence of competing metal ions such as calcium or magnesium may reduce nickel oxide solubility by forming insoluble compounds.

Overall, the solubility of nickel oxide is relatively low but can be influenced by various factors and conditions.