Initial Concentration Formula:
From: | To: |
Definition: This calculator determines the initial concentration of a weak acid solution based on its dissociation constant (Ka) and degree of dissociation (α).
Purpose: It helps chemists and students understand the relationship between acid strength, dissociation, and initial concentration.
The calculator uses the formula:
Where:
Explanation: The formula relates the initial concentration of a weak acid to its dissociation constant and the fraction of acid molecules that dissociate.
Details: Knowing the initial concentration helps in preparing solutions with desired pH levels and understanding acid-base equilibrium.
Tips: Enter the acid dissociation constant (Ka) and degree of dissociation (α, between 0 and 1). Both values must be positive numbers.
Q1: What is the degree of dissociation?
A: It's the fraction of acid molecules that dissociate into ions in solution, ranging from 0 (no dissociation) to 1 (complete dissociation).
Q2: How do I find the Ka value for an acid?
A: Ka values are typically found in chemistry reference tables or can be determined experimentally.
Q3: What units should I use for Ka?
A: The calculator assumes consistent units (mol/m³ for both Ka and concentration).
Q4: Why does the degree of dissociation need to be between 0 and 1?
A: Because it represents a fraction of molecules dissociated, where 0 means none and 1 means all molecules are dissociated.
Q5: Can I use this for strong acids?
A: No, this calculator is specifically for weak acids where the degree of dissociation is significantly less than 1.