Acid, Base, or Neutral

Today You Will… Define acid and base Determine if a substance is acidic or basic Explore why we learn about acids and bases

Why Learn about Acids & Bases? What do you think is the pH level of NYC tap water? The pH of a swimming pool must be checked periodically. Why? Is it important for Lakes & Rivers to maintain a certain pH?

Arrhenius Acids and Bases Acids produce H+ in aqueous solutions water HCl H+(aq) + Cl- (aq) Bases produce OH- in aqueous solutions NaOH Na+(aq) + OH- (aq) LecturePLUS Timberlake

LecturePLUS Timberlake Acids Produce H+ (as H3O+) ions in water Produce a negative ion (-) too Taste sour Corrode metals React with bases to form salts and water LecturePLUS Timberlake

LecturePLUS Timberlake Bases Produce OH- ions in water Taste bitter, chalky Feel soapy, slippery React with acids to form salts and water LecturePLUS Timberlake

LecturePLUS Timberlake Learning Check AB1 Describe the solution in each of the following as: 1) acid 2) base or 3)neutral. A. ___soda B. ___soap C. ___coffee D. ___ wine E. ___ water F. ___ grapefruit LecturePLUS Timberlake

LecturePLUS Timberlake Solution AB1 Describe each solution as: 1) acid 2) base or 3) neutral. A. _1_ soda B. _2_ soap C. _1_ coffee D. _1_ wine E. _3_ water F. _1_ grapefruit LecturePLUS Timberlake

LecturePLUS Timberlake Learning Check AB2 Identify each as characteristic of an A) acid or B) base ____ 1. Sour taste ____ 2. Produces OH- in aqueous solutions ____ 3. Chalky taste ____ 4. Is an electrolyte ____ 5. Produces H+ in aqueous solutions LecturePLUS Timberlake

pH pH is a measure of how acidic or basic a solution is. A pH of a solution depends on the concentration of hydrogen (H+). The pH scale ranges from 0 to 14. Acids range from 0-7. Bases range from 7-14. 7 is neutral.

Indicators An indicator is a compound (dye) that changes color in an acid or base or in both.

Indicators

pH of common household solutions Lemon juice -2.2 Soda- 2.9-3.3 Milk- 6.4 Distilled water- 7 Baking soda- 8.3 Ammonia-11.0