Definition: Acidity refers to a chemical state in which an object has low or neutral pH (pH value). The acidity level of an object can be measured using pH meters, which are commonly used in industrial laboratories to determine the amount of acid present in the environment. In general terms, acids are substances that produce hydrogen ions when they react with water. When an acid is added to a solution, it produces hydroxide ions (OH-), which can then be neutralized by the addition of a base. The pH value of a solution indicates how acidic or basic it is. For example, a pH of 7 means that a solution has a neutral pH and does not have any acid or base present in it. A pH of 8 means that a solution has a low acidity level and contains only small amounts of both hydrogen ions (OH-) and hydroxide ions (H2O). A pH of 9 means that a solution has a high acidity level, with large numbers of hydrogen ions and very few hydroxide ions present.
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