1. pH Scale & Neutralization Reactions

2. pH Scale pH: A measure of how acidic or basic (alkaline) a solution is. The pH scale is a numerical scale ranging from 0-14 that compares the acidity of solutions. 0-6.9999: Acidic 7: Neutral (neither acidic or basic) 7.00001-14: Basic

3. Some examples: SubstancepHAcidic or basic? Milk6 Baking soda8.3 Tomatoes4 Bleach12 Stomach acid1.5 Draino13 Acidic Basic Acidic Basic Acidic Basic

4. Impact of pH Farming pH of soil highly impacts which plants can grow in certain areas and which cannot. i.e: Corn prefers slightly acidic soil, beans prefer slightly basic. Consumer Products Most skin care and shampoo products are neutral (pH=7) Cleaners are usually highly basic and have HHPS symbols to indicate it. Swimming Pools To keep biologic organisms from growing pH needs to be between 7.2-7.8 Anything above / below can cause irritation to skin & eyes.

5. Neutralization Reactions Occur between an acid and a base. Both are typically ionic compounds. Skeleton equation: Acid + Base -> Water + Salt (ionic compound) Using hydrochloric acid and sodium hydroxide (base): HCl(aq) + NaOH(aq) -> H 2 O(aq) + NaCl(aq)

6. Antacids Your stomach produces a solution of hydrochloric acid (pH = 1.5) Stomach acid can lead to irritation (heartburn) of the stomach lining and lining of the esophagus. Antacids are designed to neutralize the acid. Tums (Calcium carbonate) and stomach acid: CaCO 3 + 2HCl -> CO 2 + H 2 O + CaCl 2

7. Homework P.275 #2-4,6 P.281 #1,2,7 Neutralization worksheet