Consider the following data on some weak acids and weak bases: Ka formula acetic acid HCH3CO₂ 1.8 x 10-5 HNO₂ name nitrous acid acid solution 0.1 M NaCH3CO₂ 0.1 M KNO₂ 0.1 M HONHgBr 0.1 M CH3NH3Cl 4.5 x 10 Use this data to rank the following solutions in order of increasing pH. In other words, select a '1' next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on. -4 DH choose one choose one choose one base choose one K₂ formula methylamine CH3NH₂ 4.4 x 10 hydroxylamine HONH₂ 1.1×108 name

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### Understanding pH Rankings of Various Solutions

Consider the following data on some weak acids and weak bases:

#### Weak Acids
|name        | formula  | \( K_a \)      |
|------------|----------|----------------|
| acetic acid| \( \text{HCH}_3\text{CO}_2 \) | \( 1.8 \times 10^{-5} \) |
| nitrous acid | \( \text{HNO}_2 \)         | \( 4.5 \times 10^{-4} \) |

#### Weak Bases
|name          | formula  | \( K_b \)      |
|--------------|----------|----------------|
| methylamine  | \( \text{CH}_3\text{NH}_2 \) | \( 4.4 \times 10^{-4} \) |
| hydroxylamine| \( \text{HONH}_2 \)        | \( 1.1 \times 10^{-8} \)  |

Use this data to rank the following solutions in order of increasing pH. In other words, select a '1' next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on.

### Solutions to Rank by pH
| solution                  | pH          |
|---------------------------|-------------|
| 0.1 M NaCH\(_{3}\)CO\(_{2}\) | [Choose one] |
| 0.1 M KNO\(_{2}\)         | [Choose one] |
| 0.1 M HONH\(_{3}\)Br      | [Choose one] |
| 0.1 M CH\(_{3}\)NH\(_{3}\)Cl | [Choose one] |

### Explanation

To rank the pH of these solutions, one needs to consider the relative strengths of the acids and bases, which are reflected in their \( K_a \) and \( K_b \) values. 

- **The acid dissociation constant \( K_a \)** indicates the strength of the acid. A larger \( K_a \) value means a stronger acid, which will dissociate more in solution, resulting in a lower pH.
- **The base dissociation constant \( K_b \)** indicates the strength of the base. A larger \( K
Transcribed Image Text:### Understanding pH Rankings of Various Solutions Consider the following data on some weak acids and weak bases: #### Weak Acids |name | formula | \( K_a \) | |------------|----------|----------------| | acetic acid| \( \text{HCH}_3\text{CO}_2 \) | \( 1.8 \times 10^{-5} \) | | nitrous acid | \( \text{HNO}_2 \) | \( 4.5 \times 10^{-4} \) | #### Weak Bases |name | formula | \( K_b \) | |--------------|----------|----------------| | methylamine | \( \text{CH}_3\text{NH}_2 \) | \( 4.4 \times 10^{-4} \) | | hydroxylamine| \( \text{HONH}_2 \) | \( 1.1 \times 10^{-8} \) | Use this data to rank the following solutions in order of increasing pH. In other words, select a '1' next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on. ### Solutions to Rank by pH | solution | pH | |---------------------------|-------------| | 0.1 M NaCH\(_{3}\)CO\(_{2}\) | [Choose one] | | 0.1 M KNO\(_{2}\) | [Choose one] | | 0.1 M HONH\(_{3}\)Br | [Choose one] | | 0.1 M CH\(_{3}\)NH\(_{3}\)Cl | [Choose one] | ### Explanation To rank the pH of these solutions, one needs to consider the relative strengths of the acids and bases, which are reflected in their \( K_a \) and \( K_b \) values. - **The acid dissociation constant \( K_a \)** indicates the strength of the acid. A larger \( K_a \) value means a stronger acid, which will dissociate more in solution, resulting in a lower pH. - **The base dissociation constant \( K_b \)** indicates the strength of the base. A larger \( K
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