1. Strong and Weak Electrolytes

2. Substances whose aqueous solutions produce lots of free moving ions are called STRONG ELECTROLYTES! Substances whose aqueous solutions produce few free moving ions are called WEAK ELECTROLYTES! Substances whose aqueous solutions are good conductors of electricity are called STRONG ELECTROLYTES! Substances whose aqueous solutions are poor conductors of electricity are called WEAK ELECTROLYTES! + + + ― ― ― ― + + ―

3. Strong and Weak Electrolytes Strong acids, strong bases and soluble salts are STRONG ELECTROLYTES! HI, HBr, HCl, HNO 3, and H 2 SO 4 are strong acids (the rest are weak). LiOH, NaOH, KOH, RbOH, and CsOH are strong bases (the rest are weak). Weak acids, weak bases, & insoluble salts are WEAK ELECTROLYTES! + + + ― ― ― ― + + ―

4. Strong and Weak Electrolytes Ex.1) Which of the following substances would most likely be the best electrolyte? (1) KNO 3 (3) CH 3 COOH (2) Ag 2 SO 4 (4) NH 3 Ex.2) Which of the following solutions would be the best conductor of electricity? (1) AgBr (aq) (3) Li 2 CO 3(aq) (2) BaSO 4(aq) (4) PbI 2(aq) Ex.3) Which of the following substances would produce the greatest number of free moving ions when in a saturated aqueous solution? (1) HCl(3) Mg(OH) 2 (2) Ag 2 S (4) HC 2 H 3 O 2 soluble salt insoluble salt strong acid weak acid weak base