5.1 Learning Checkpoints

5.1 Acids and Bases

Page 197

Learning Checkpoint

1. Is a solution with a pH of 11 acidic of basic?

A solution with a pH of 11 is basic.

2. Is a solution with a pH of 5 acidic or basic?

A solution with a pH of 5 is acidic.

3. What is the pH of pure water?

Pure water has a pH of 7.

4. Could you determine a specific pH value for a solution using blue litmus paper? Explain.

No you could not determine a specific pH value, as blue litmus paper shows whether the solution is acidic or not.

5. What is the advantage of using a universal indicator.

A universal indicator helps you determine the pH level more specifically than litmus paper.

Page 201

Learning Checkpoint

1. Name the following bases.

(a) KOH(s) - Potassium hydroxide (caustic soda)
(b) Ca(OH)2(s) - Calcium hydroxide (hydrated lime)
(c) Mg(OH)2(s) - Magnesium hydroxide (milk of magnesia)
(d) NH4OH(aq) - Ammonium hydroxide (ammonia solution)

2. Which polyatomic group is found at the end of the chemical formula for most bases?

OH or hydorxide