1. Electrical Conductivity

2. Questions (copy them out first) Give the definition and an example for the following terms: 1)A solution is__________________? 2)An aqueous solution is___________? 3)Concentration in PPM____________? 4) What is the percent of KCl if 15 g KCl are placed in 75 g water? 5) p.28 of your workbook question 1 & 2

3. Electrolyte and Non-electrolyte Electrolyte: a substance that conducts electricity when dissolved in water.

4. Electrolytes Some solutes can dissociate into ions.

5. Types of solutes Na + Cl - Strong Electrolyte - 100% dissociation, all ions in solution high conductivity

6. Electrical Conductivity: Is a measure of a solutions ability to allow an electric current to flow through it.

8. Electrolytic Dissociation: Is the separation of a dissolved compound into two ions of opposite charges

9. Question? 1) What happens when an electrolyte is dissolved in water? (give an example) 2) What happens when a nonelectrolyte is dissolved? (give an example)

10. What happens when an electrolyte is dissolved in water? Answer: Ions are produced. Example NaCl (table salt) The ions formed during electrolytic dissociation conduct electricity.

11. What happens when a nonelectrolyte is dissolved? Answer: No ions are produced Example: Sugar

12. Types of Electrolytes 1)Acids  Is a substance that releases H+ ions in an aqueous solution 2) Bases  Is a substance that releases OH- ions in an aqueous solution 3) Salts  Is a substance produced by the chemical bonding of a metallic ion and a nonmetallic ion (not H+ and OH-)

13. Questions Give two examples of an acid, a base, and a salt and show how they dissociate in an aqueous solution.

14. Answer Acid: Hydrochloric Acid HCl (g)  H + (aq) + Cl - (aq) Look at page 58 & 59 for tips

15. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.

16. Questions A solution with a pH of 4 is 10times more acidic than a solution with a pH of 5 1) How many times more acidic is a solution of pH 2 than a solution with pH 4? 2) How many times less basic is a solution with a pH 8 compared to a solution with pH 11?

17. 1) How many times more acidic is a solution of pH 2 than a solution with pH 4? Answer: 100

18. 2) How many times less basic is a solution with a pH 8 compared to a solution with pH 11? Answer: 1000

19. In Class Work Page 64 & 65 of your textbook. Do questions: 31, 32, 33 and A on page 65