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an acid is any substance that has pH of less than 7. The pH scale is used to measure how acid or alkali a substance is:

Explanation:

0-3 = strong acid (UI turns red)

4-6 = weak acid (UI turns orange/yellow)

7 = neutral (UI turns green)

8-10 = weak alkali (UI turns blue)

11-14 = strong alkali (UI turns purple)

The pH of an acid is determined by the concentration of Hydrogen ions (H+) the substance has when in solution. All acids contain hydrogen ions when in solution; the higher the concentration of H+ ions, the lower the pH.

Fast Fact: Bee stings are acidic. They can be neutralized using baking powder which contains sodium hydrogen carbonate.

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Explanation: