What is the range of the pH scale?

What range are acids?

What range are bases?

1 to 14

1 - 6.9

7.1 - 14

Explanation:

The pH scale is a convenient scale for expressing the level of acidity or bascity of aqueous solutions. The pH is given as the negative logarithm to base 10 of the hydrogen ion  in the solution.

      Acidity increases                              Alkalinity increases

   1                                            7                                                 14

                                       neutral point

the answer is c.the valence of the atoms combine .