What is most likely an example of a chemical reaction

Chemical reactions often involve color changes, temperature changes, gas production, or precipitant formation. Simple examples of everyday reactions include digestion, combustion, and cooking. Plants apply a chemical reaction called photosynthesis to convert carbon dioxide and water into food (glucose) and oxygen.

Explanation:you could break it down to your own words

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l