On the pH scale, which ranges from 0 to 14, a substance is considered basic if it has a pH greater than 7. A basic substance has a higher concentration of hydroxide ions (OH-) and a lower concentration of hydrogen ions (H+) compared to a neutral substance, such as pure water. The pH scale is logarithmic, meaning that each increment on the scale represents a tenfold difference in acidity or basicity. For example, a substance with a pH of 8 is ten times more basic than a substance with a pH of 7, and a substance with a pH of 9 is 100 times more basic than a substance with a pH of 7. There are many substances that are basic, including household cleaning products like ammonia and bleach, and personal care products like soap and shampoo. The pH of a substance can be measured using a pH meter or pH test strips. It is important to note that the pH of a substance can be affected by various factors, such as the presence of dissolved minerals or other substances, and can change over time.