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Acids, Bases and pH. 1. Acids Any compound that GIVES OFF H+ ions in solution Any compound that GIVES OFF H+ ions in solution Ex. HCl H+ and Cl- Ex. HCl.

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Presentation on theme: "Acids, Bases and pH. 1. Acids Any compound that GIVES OFF H+ ions in solution Any compound that GIVES OFF H+ ions in solution Ex. HCl H+ and Cl- Ex. HCl."— Presentation transcript:

1 Acids, Bases and pH

2 1. Acids Any compound that GIVES OFF H+ ions in solution Any compound that GIVES OFF H+ ions in solution Ex. HCl H+ and Cl- Ex. HCl H+ and Cl- Traits: Traits: Sour Sour ex. Juices, vinegar, HCl ex. Juices, vinegar, HCl Add water

3 2. Bases Any compound that GIVES OFF OH- ions in solution Any compound that GIVES OFF OH- ions in solution Ex. NaOH Na+ and OH- Ex. NaOH Na+ and OH- Traits: Traits: Slippery Slippery Ex. Soaps, detergent, ammonia Ex. Soaps, detergent, ammonia Add water

4 3. Neutralization Equal amounts of acid and base together Equal amounts of acid and base together Acid (H+) Acid (H+) + Base (OH-) + Base (OH-) HOH = HO HOH = H 2 O A’s and B’s make salts when you have same amounts A’s and B’s make salts when you have same amounts Ex. Ex. HCl (Hydrochloric acid) + NaOH (Sodium hydroxide)  H 2 O (water) + NaCl (table salt)

5 4. BUFFERS prevent sudden pH change substances that react with strong acids or bases to prevent sudden pH change What do you take when stomach is upset?? (HINT: What digestive factor is in the stomach??) What do you take when stomach is upset?? (HINT: What digestive factor is in the stomach??) Antacids (made of calcium carbonate…a weak base!) Antacids (made of calcium carbonate…a weak base!)

6 5. pH scale measures the concentration strength of acids and bases. –pH 0-6.9 = acid Strong acids 1-3 –pH 7.1-14 = base Strong base pH 11 - 14 –pH 7 = neutral (water ) VIDEO: (3:49) http://www.brainpop.com/science/matterandchemistry/phscale/

7 Tests for Acids or bases Turns Red = acidic Turns Blue = basic 6. Litmus paper

8 Let’s Practice ……pH activity YOU TRY: Go to my website. Click on Living Environment Homepage. Then click on the link for The Biochemistry Page. Go to pH activity and complete each activity. YOU TRY: Go to my website. Click on Living Environment Homepage. Then click on the link for The Biochemistry Page. Go to pH activity and complete each activity. Go to a computer and use the site below to conduct an investigation on acids and bases. Go to a computer and use the site below to conduct an investigation on acids and bases. Go to a computer and use the site below to conduct an investigation on acids and bases. Go to a computer and use the site below to conduct an investigation on acids and bases. pH Scale activity Watch VIDEO: (3:49) http://www.brainpop.com/science/matterandchemistry/phscale/

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