pH: MEASURING ACIDITY AND ALKALINITY

The negative log (antilog) of hydrogen ion concentration is called pH. Hydrogen and hydroxyl ions affect the chemical reactions in the cells. Therefore, the concentrations of these ions in body fluids are important. The higher the concentration of hydrogen ions on, the more acidic the solution. The higher the concentration of hydroxyl (OH-) ions, the more basic (alkaline) the solution. A neutral solution has equal number of hydrogen ion and hydroxyl ions. The pH scale measures acidity and alkalinity. It runs from 0 to 14.

• Acidic solutions have a pH less than 7.
• The Fa-sic (alkaline) solutions have a pH above 7.
• A p1-1 of 7 is neutral.

Each whok. number on the pH scale represents a tenfold change (logarithmio . • Acidity. Therefore, a solution with a pH of 3 is 10 times

more acidic that. …Autoignition a pH of 4. A olf of 9 is 10

..me› more

basic than a      o 8.

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