What is a substance with a pH level of 9?

A substance with a pH level of 9 is considered basic or alkaline. In terms of hydrogen ion concentration, a pH of 9 indicates that the substance has a lower concentration of hydrogen ions compared to neutral water (pH 7). This means that the substance is more likely to accept protons in a chemical reaction, making it a base. Examples of substances with a pH of 9 include baking soda (sodium bicarbonate) and seawater.