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Definition: This calculator determines how many moles of a substance dissociate based on the degree of dissociation and initial number of moles.
Purpose: It helps chemists understand the extent of dissociation in chemical reactions at equilibrium.
The calculator uses the formula:
Where:
Explanation: The degree of dissociation (α) represents the fraction of initial moles that dissociate. Multiplying this by the initial moles gives the actual number of moles dissociated.
Details: Understanding dissociation is crucial for equilibrium calculations, pH determinations, and predicting reaction yields.
Tips: Enter the degree of dissociation (between 0 and 1) and initial number of moles (must be > 0). The degree represents fraction dissociated (0.5 = 50% dissociation).
Q1: What does degree of dissociation mean?
A: It's the fraction of initial molecules that dissociate into ions or products at equilibrium (0 = no dissociation, 1 = complete dissociation).
Q2: Can degree of dissociation be greater than 1?
A: No, it's a fraction between 0 and 1, representing 0% to 100% dissociation.
Q3: How does temperature affect dissociation?
A: For endothermic dissociation, higher temperature increases degree of dissociation. The opposite for exothermic dissociation.
Q4: What's a typical degree of dissociation for weak acids?
A: Weak acids typically have α << 1 (e.g., acetic acid ~1% dissociation at 0.1M).
Q5: How is this different from percent dissociation?
A: Degree of dissociation is the decimal form (0.05), while percent dissociation is 100× (5%).