What is the pH range of sodium hydroxide?

The pH range of sodium hydroxide is typically around 9.6 to 10.6 when it is in solution, indicating that it is a strongly alkaline substance. This high pH reflects its basic nature, which is due to the presence of hydroxide ions (OH-) that it produces when dissolved in water. Sodium hydroxide dissociates completely in water, leading to a significant increase in hydroxide ion concentration, which raises the pH into the alkaline range.

Understanding the properties of sodium hydroxide is important in various applications, including chemistry and industry, as its basicity can affect reactions and processes in which it is involved. The other ranges listed do not accurately represent the pH of sodium hydroxide solutions, which is why they do not apply. The specific alkaline nature indicated in the correct choice emphasizes its strong basic properties and aligns with its use in various chemical applications.