Formula Used:
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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 these important acid dissociation parameters.
The calculator uses the formula:
Where:
Explanation: The formula relates the initial concentration to the acid's dissociation properties, showing how much undissociated acid was originally present.
Details: Knowing the initial concentration helps in preparing solutions with desired properties, understanding acid strength, and predicting reaction behavior.
Tips: Enter the dissociation constant (Ka) and degree of dissociation (α, between 0 and 1). The degree of dissociation must be greater than 0 and less than or equal to 1.
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 concentration), but Ka is often given in mol/L. Make sure to convert if necessary.
Q4: Why does the degree of dissociation need to be between 0 and 1?
A: It represents a fraction (0% to 100%) of molecules that dissociate. Values outside this range are physically meaningless.
Q5: Can I use this for strong acids?
A: No, this calculator is specifically for weak acids that don't completely dissociate in solution.