The pH is under 7.
The presence of an acid lowers the pH of the solution in water.
The presence of an acid reduces the pH.
The presence of an acid reduces the pH.
The presence of an acid reduces the pH.
The presence of an acid reduces the pH.
The presence of an acid reduces the pH.
The presence of an acid reduces the pH.
The presence of an acid reduces the pH.
The presence of an acid reduces the pH.
The pH become lower, under 7.
The presence of an acid in a water solution lowers the pH of the solution by increasing the concentration of hydrogen ions (H+). Acids release H+ ions in water, which increases the acidity of the solution. The lower the pH, the more acidic the solution.
An acid is capable of releasing (donating) protons to watermolecules, thus lowering the pH to acidic level (below 7, in water)