Dissociation Constant Kb given Initial Concentration of Weak Base and Degree of Dissociation Calculator

Dissociation Constant Formula:

\[ K_b = \frac{C_0 \times \alpha^2}{1 - \alpha} \]

Dissociation Constant (Kb):

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1. What is Dissociation Constant of Weak Base?

Definition: The dissociation constant (Kb) measures the extent to which a weak base dissociates in water to form hydroxide ions (OH⁻) and its conjugate acid.

Purpose: It quantifies the strength of a weak base and helps predict its behavior in aqueous solutions.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ K_b = \frac{C_0 \times \alpha^2}{1 - \alpha} \]

Where:

\( K_b \) — Dissociation constant of weak base
\( C_0 \) — Initial concentration of weak base (mol/m³)
\( \alpha \) — Degree of dissociation (0 to 1)

Explanation: The formula relates the dissociation constant to the initial concentration and the fraction of base molecules that dissociate.

3. Importance of Dissociation Constant

Details: Kb values help chemists understand base strength, predict pH of solutions, and design buffer systems.

4. Using the Calculator

Tips: Enter the initial concentration in mol/m³ and degree of dissociation (between 0 and 1). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is degree of dissociation?
A: It's the fraction of base molecules that dissociate into ions in solution (ranges from 0 to 1).

Q2: What are typical Kb values for weak bases?
A: Weak bases typically have Kb values between 10⁻² and 10⁻¹⁰. Stronger bases have higher Kb values.

Q3: How does concentration affect Kb?
A: Kb is a constant at a given temperature, but the degree of dissociation changes with concentration.

Q4: Can degree of dissociation be greater than 1?
A: No, it represents a fraction (0 = no dissociation, 1 = complete dissociation).

Q5: What's the relationship between Kb and pKb?
A: pKb = -log10(Kb). Lower pKb values indicate stronger bases.