Experiment 13 Acids, Bases, and Salts pH p' 169

1
Experiment 13 Acids, Bases, and Salts pHp. 169

• To become familiar with the chemical and physical
  properties of acids and bases.
• To measure the pH of laboratory and household
  acid, base, and salt solutions.

2
Introduction

• Inorganic and organic acids are important
  industrial chemicals in 2002, H2SO4 was the
  number 1 chemical produced in the U.S.
• 36,000,000 metric tons (80,000,000,000 lbs)
• 1metric ton 1000Kg 2204.6lbs

3
Introduction

• Some common household acids
• Vinegar CH3COOH
• Citric acid
• Ascorbic acid

4
Introduction

• Some common household bases
• Ammonia - NH3 (cleaners)
• Sodium hydroxide NaOH (oven cleaner and drain
  cleaner)
• Calcium oxide CaO (cement)
• See Appendix D for more examples

5
Introduction

• Physical properties of acids
• Sour/tart taste
• Pricking/stinging sensation on the skin
• blue to red
• Physical properties of bases
• Bitter taste
• Slippery to touch
• red to blue

6
Introduction

• Salts are produced by an acid/base
  neutralization
• 2HCl Ca(OH)2 ? 2H2O CaCl2
• H2SO4 2NaOH ? Na2SO4 2H2O
• pH -logH3O
• 10-H3O - calculator keys -7, 2nd log
• pH lt7 acidic
• pH 7gt basic
• pH 7 neutral

7
Lab Notes

• Different groups will start on different sections
  so there isnt a long wait for the chemicals.
• A.4. omit
• B.3. omit
• C.1. You will be using well plates check out
  from stockroom
• C.1. Use universal paper instead of universal
  indicator. Check out windows from stockroom

8
Lab Notes

• You will be using strong acids and strong bases
  in this experiment. Wear gloves and handle with
  care.

9
Report Sheet

• No questions