1. Acids Sour taste Change the color of acid-base indicators
(turn litmus to red)
Some react with active metals and release hydrogen gas, H2
React with bases to produce salts and water
(Neutralization reactions)
Contain H+ when dissolved in aqueous solutions
pH less than 7
Binary acids, oxyacids and organic acids

2. Bases Taste bitter Change the color of acid-base indicators
(turn litmus to blue)
Dilute aqueous solutions feel slippery
React with acids to produce salts and water
pH more than 7
Many soluble bases (alkali) contain hydroxide ions (OH-)

3. Definitions of Acids and Bases
Arrhenius
Acid : compound that creates H+ in an aqueous solution
Base : compound that creates OH- in an aqueous solution
The H+ ion attracts other molecules or ions so strongly that it normally exists as the hydronium ion (H3O+)

4. Types of acids
Monoprotic acids
Only have one acidic proton (one hydrogen ion)
ex. HClO4, HCl, HNO3
Polyprotic acids (diprotic, triprotic)
Can have more than one proton (hydrogen ion)
ex. H2SO4, H3PO4

5. Water can act as an acid or a base!!!
Interesting fact…
Water can act as an acid or a base!!!
Amphoteric compound: Any compound that can act as either an acid or a base

6. pH scale