AP BIOLOGY

Detailed explanation-1: -pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

Detailed explanation-2: -It happens that at pH 7, the concentrations of H+ and OH-are equal. This is why pH 7 is considered the neutral pH. Below pH 7, the concentration of H+ is greater than the concentration of OH-, making the water acidic. Above pH 7, the concentration of OH-is greater than the concentration of H+, making the water basic.

Detailed explanation-3: -The pH of water: What to know. In its purest form, water has a pH of 7, which is at the exact center of the pH scale. Particles in the water can change the pH of the water, and most water for use has a pH of somewhere between 6.5 and 8.5.

Detailed explanation-4: -Ions are just atoms that have an electric charge on them, so H+ is a hydrogen atom with charge of 1. Even in pure water ions tend to form due to random processes (producing some H+ and OH-ions). The amount of H+ that is made in pure water is about equal to a pH of 7. That’s why 7 is neutral.

Detailed explanation-5: -As you can see from the pH scale above, pure water has a pH value of 7. This value is considered neutral-neither acidic or basic.