Formula Used:
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Definition: This calculator determines the initial concentration of a weak base solution using its dissociation constant (Kb) and degree of dissociation (α).
Purpose: It helps chemistry students and professionals calculate the original concentration of a weak base before dissociation occurs.
The calculator uses the formula:
Where:
Explanation: The dissociation constant is divided by the square of the degree of dissociation to find the original concentration before any dissociation occurred.
Details: Knowing the initial concentration is crucial for preparing solutions, predicting reaction outcomes, and understanding acid-base equilibria.
Tips: Enter the dissociation constant (Kb) and degree of dissociation (α, between 0 and 1). Both values must be > 0.
Q1: What is the degree of dissociation?
A: It's the fraction of original solute molecules that dissociate into ions (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 10-12.
Q3: Why does the formula use α squared?
A: The square accounts for the equilibrium expression where both the base and its conjugate acid are involved.
Q4: Can I use this for strong bases?
A: No, this formula only applies to weak bases that don't completely dissociate.
Q5: What units should I use?
A: The calculator uses consistent units (mol/m³), but you can convert results as needed.