The acidity or alkalinity of a solution is gauged by its pH. A solution's pH can be determined by how many hydrogen ions are present in it.
The number of hydrogen ions in a sample solution is counted during this pH test. While alkaline substances have a high pH when few hydrogen ions (basic substances) are present, acidic compounds have a low pH when there are many hydrogen ions.
The relationship between pH and the total hydrogen ion concentration can be determined using the pH scale. As a result, pH falls when there are more hydrogen ions present and rises when there are less hydrogen ions. Changing the pH scale by one unit results in a 10-fold difference in hydrogen ion concentration, while changing it by two units results in
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