3 Acids and Bases When we think of acids and bases we tend to think of science labs and chemicals….but did you know……Acids cause:Lemons to be sourAcid rain to eat away at sculpturesFramed painting to be damagedCavities in your teethFood to digest in your stomachAnts and bees use it to sting!
5 Properties of Acids and Bases Tastes sourAcids corrode metalsPositively charged hydrogen ions (H+)Taste bitterFeel slipperyMost hand soaps and drain cleaners are basesNegatively charged hydroxide ions (OH-)
6 pH Scale Neutral 7 Acid Base 14 14pH ScaleZumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 515
7 Understanding the pH Scale pH stands for: Presence of HydrogenNumbered from 0 to 14The lower the pH number the higher the Acidthat means more hydrogen ions (H+)The higher the pH number the higher the Basethat means less hydrogen ions (H+)
8 Common Acids Hydrochloric Acid Citric Acid Lactic Acid Stomach acid: has the sour taste of acidCitric AcidCitrus fruits such as lemons, grapefruit, oranges and limesLactic AcidSour milk, sour cream, yogurt and cottage cheese.
9 Common BasesAmmonia-Used in household cleaning materials and fertilizer. **Most Common!**Calcium hydroxide-Used to make mortar and plasterSodium hydroxideUsed in oven and drain cleaners **One of the strongest bases**
10 Virtual Lab What is the pH of common solutions?