1. 1 Acids and Bases Properties of Matter AM CARRIER

2. 2 Acids þ Produce H + ions in water þ Turns litmus paper RED þ Taste sour, Feel squeeky þ Corrode materials þ Conduct Electricity þ React with bases to form salts and water þ Measure 0-6 on the pH scale

3. 3 Some Common Acids HCl hydrochloric acid (stomach) H 2 CO 3 carbonic acid (acid rain) H 3 PO 4 phosphoric acid (Coca Cola) H 2 SO 4 sulfuric acid (Batteries) CH 3 COOH acetic acid (Pickles)

4. 4 Bases Produce OH - ions in water Turns Litmus Paper BLUE Taste bitter, chalky Feel soapy, slippery Also conduct electricity React with acids to form salts and water Measure 8-14 on the pH scale

5. 5 Some Common Bases NaOHsodium hydroxide (DRANO) KOH potassium hydroxide (Tie Dye) Na 2 CO 3 sodium carbonate (baking soda) Mg(OH) 2 magnesium hydroxide (MOM) Al(OH) 3 aluminum hydroxide (TUMS)

6. pH Scale (potential of Hydrogen) Lots of H+ IONS Lots of OH- IONS Few to NO IONS

7. ACTIVITY DIRECTIONS Observe: Which samples are acids & which are bases? Hypothesis: Discuss with your group. Experiment: Take a clean Qtip and insert it into the solution. Wipe it onto the paper. If it is a Base, it will turn the paper orange; if its an acid, it will erase the orange mark. Test all six substances. Conclusion: Which are acids & which are bases? 7

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9. 9 Learning Check 1 Describe the solution in each of the following as: 1) acid 2) base or 3)neutral. A. ___soda B. ___soap C. ___coffee D. ___ wine E. ___ water F. ___ grapefruit

10. 10 Solution 1 Describe each solution as: 1) acid 2) base or 3) neutral. A. _1_ soda B. _2_ soap C. _1_ coffee D. _1_ wine E. _3_ water F. _1_ grapefruit

11. 11 Learning Check 2 Identify each as characteristic of an A) acid or B) base ____ 1. Sour taste ____ 2. Produces OH - in aqueous solutions ____ 3. Chalky taste ____ 4. Is corrosive ____ 5. Produces H + in aqueous solutions

12. 12 Solution 2 Identify each as a characteristic of an A) acid or B) base _A_ 1. Sour taste _B_ 2. Produces OH - in aqueous solutions _B_ 3. Chalky taste A 4. Is an electrolyte _A_ 5. Produces H + in aqueous solutions

13. 13 Learning Check 3 Match the formulas with the names: A. ___ HNO 2 1) hydrochloric acid B. ___Ca(OH) 2 2) sulfuric acid C. ___H 2 SO 4 3) sodium hydroxide D. ___HCl4) nitrous acid E. ___NaOH5) calcium hydroxide

14. 14 Solution 3 Match the formulas with the names: A. _4__ HNO 2 1) hydrochloric acid B. _5__Ca(OH) 2 2) sulfuric acid C. _2__H 2 SO 4 3) sodium hydroxide D. _1__HCl4) nitrous acid E. _3__NaOH5) calcium hydroxide

15. 15 Arrhenius Acids and Bases Acids produce H + in aqueous solutions water HCl H + (aq) + Cl - (aq) Bases produce OH - in aqueous solutions water NaOH Na + (aq) + OH - (aq)