A 0.0015 M solution of a weak base has a pH of 9.84. Calculate Kb. Fill in reaction > Initial concentration Change in concentration Equilibrium concentration

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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**Week 9 - CHM 2046 Chapter 16 Quiz**

**Name:______________________________**

**Problem Statement:**
A 0.0015 M solution of a weak base has a pH of 9.84. Calculate \( K_b \).

**Table Details:**

The table below is designed to organize the solution data for further analysis:

|                                |                               |
|-------------------------------|-------------------------------|
| **Fill in reaction →**       |                               |
| **Initial concentration**    |                               |
| **Change in concentration**  |                               |
| **Equilibrium concentration** |                               |

### Explanation:

- **Fill in reaction →**: This row is for detailing the chemical reaction of the weak base.
- **Initial concentration**: Here, you denote the starting concentration of the weak base before any dissociation.
- **Change in concentration**: This row captures the change in molarity as the reaction approaches equilibrium.
- **Equilibrium concentration**: In this row, you calculate and fill in the concentrations of reactants and products at equilibrium. 

The task involves using the equilibrium expression for \( K_b \) calculation, likely employing the formula:

\[
K_b = \frac{[OH^-][BH^+]}{[B]}
\]

Utilizing the pH value provided to find the \( pOH \), and subsequently, the \( [OH^-] \) concentration for the computation of \( K_b \).
Transcribed Image Text:**Week 9 - CHM 2046 Chapter 16 Quiz** **Name:______________________________** **Problem Statement:** A 0.0015 M solution of a weak base has a pH of 9.84. Calculate \( K_b \). **Table Details:** The table below is designed to organize the solution data for further analysis: | | | |-------------------------------|-------------------------------| | **Fill in reaction →** | | | **Initial concentration** | | | **Change in concentration** | | | **Equilibrium concentration** | | ### Explanation: - **Fill in reaction →**: This row is for detailing the chemical reaction of the weak base. - **Initial concentration**: Here, you denote the starting concentration of the weak base before any dissociation. - **Change in concentration**: This row captures the change in molarity as the reaction approaches equilibrium. - **Equilibrium concentration**: In this row, you calculate and fill in the concentrations of reactants and products at equilibrium. The task involves using the equilibrium expression for \( K_b \) calculation, likely employing the formula: \[ K_b = \frac{[OH^-][BH^+]}{[B]} \] Utilizing the pH value provided to find the \( pOH \), and subsequently, the \( [OH^-] \) concentration for the computation of \( K_b \).
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