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 transcript:

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 H+ and Cl- Traits: Traits: Sour Sour ex. Juices, vinegar, HCl ex. Juices, vinegar, HCl Add water

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

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)

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!)

5. pH scale measures the concentration strength of acids and bases. –pH = acid Strong acids 1-3 –pH = base Strong base pH –pH 7 = neutral (water ) VIDEO: (3:49)

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

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)