A solution with a pH value which is less than 7 is acidic. The acids which react with metals usually have quite a low pH, of either 3 or less. Some metals react with acids and when they do the ...

Acid is a water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt. A corrosive liquid with a pH less than 7; a solution of in water of a ...