Acids and Bases Lab

[Write Name Here]

Professor Meyer

Acids and Bases Lab

Due: Friday September 25th, 2020

 

 

 

Acids and Bases Lab

 

 

Substance	pH Paper Value	pH Meter Value
1 – Cal 4.0 pH
2 – Cal 7.0 pH
3 – Cal 10 pH
4 – QC high
5 – QC low
6 – Urine #3

 

 

 

—————————— Check Your Understanding —————————

 

1.1 Carbon dioxide is bubbled through a pink basic solution and a color change occurs. What color is seen and what compound is formed?

 

 

1.2 Which of the two methods to measure the pH of a sample is more accurate: pH paper or pH meter?

 

 

1.3 The commonly used indicator phenolphthalein will turn [fill in the blank here] in a basic solution and in an acidic solution is [fill in the blank here]

 

2.1 What causes heartburn and how do over-the-counter antacids work to help people suffering with heartburn?

 

 

 

 

———————————— Chapter 4 Review —————————————

 

1. Compare and contrast an acid and a base, and provide examples of each

 

 

2. The pH scale has a range from 0 to [fill in the blank here]. A substance with a pH less than 7 is considered a/an [fill in the blank here] and a substance with a pH greater than 7 is a/an [fill in the blank here].

 

 

3. If tomato juice has a pH of 3, how many more H+ ions are present in lemon juice with a pH of 2?

 

 

4. Which of the following reactions are seen with an acid?

a. An acid turns blue litmus paper red, is colorless in phenolphthalein, and turns methyl orange indicator yellow.

b. An acid turns blue litmus paper red, is colorless in phenolphthalein, and turns methyl orange indicator red.

c. An acid turns blue litmus paper blue, turns phenolphthalein pink, and turns methyl orange indicator yellow.

d. An acid turns blue litmus paper blue, is colorless in phenolphthalein, and turns methyl orange indicator yellow.

 

 

5. One method used to determine the pH of a substance is using pH paper. Describes the composition of the paper, how the procedure is performed, and the accuracy compared to a pH meter.

 

 

6. What is an ionic bond? Give an example.

 

 

7. What is a covalent bond? Give an example.

 

 

 

 

 

 

 

 

 

 

8. Label each characteristic or example below as describing either acids (A) or bases (B):

 

Characteristic Listed		Acids (A) or Bases (B)
These have a bitter taste.
These contribute one or more hydrogen atoms to a solution when it dissociates in water.
These have a sour taste.
These have a pH greater than 7.
These react with certain metals, which results I liberation of hydrogen gas.
These have a slippery feel.
The chemical compound delivered by a be sting is an example.
These release hydroxide ions in solution.
Carbonated water is an example.
Sodium hydroxide is an example.

 

 

9. An old saying is “oil and water don’t mix.” This is the same situation for oil and vinegar. Explain why?