3Acids 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!
5Properties 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-)
6pH Scale Neutral 7 Acid Base 14 14pH ScaleZumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 515
7Understanding 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+)
8Common 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.
9Common 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**