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Acids, Bases & Salts

Scientists use a pH scale to measure the strength of acids and bases. The pH scale ranges from 0 to 14 . Substances with pH < 7 are acids ; the lower the pH, the stronger the acid. Substances with pH 7-14 are bases ; the higher the pH the stronger the base. Neutral solutions have a pH of exactly 7 . H O H ( ) O H (+) H