(c) alkaline
Aqueous solutions of washing soap, also known as soap solutions, are typically alkaline in nature. Soap is a type of surfactant that has both hydrophilic (water-loving) and hydrophobic (water-repellent) ends. When soap is dissolved in water, it forms soap micelles, which are clusters of soap molecules with the hydrophobic tails inside the micelle and the hydrophilic heads pointing outward.
Soap solutions have a pH value greater than 7, indicating their alkaline nature. The alkalinity is a result of the presence of the hydroxide ions (OH-) from the soap molecules in the solution. This alkaline property makes soap solutions effective at removing grease, oils, and dirt from surfaces during the process of cleaning.
