Molality Formula:
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Definition: This calculator determines the molality of a 1:1 electrolyte solution based on the mean ionic activity and mean activity coefficient.
Purpose: It helps chemists and researchers calculate the effective concentration of ions in electrolyte solutions.
The calculator uses the formula:
Where:
Explanation: The mean ionic activity is divided by the mean activity coefficient to obtain the molality of the solution.
Details: Molality is important in electrolyte solutions as it remains unchanged with temperature variations, unlike molarity.
Tips: Enter the mean ionic activity in mol/kg and the mean activity coefficient (default 0.5). All values must be > 0.
Q1: What is a uni-univalent electrolyte?
A: It's an electrolyte where both cation and anion have a charge of +1 and -1 respectively (e.g., NaCl, KCl).
Q2: What's a typical mean activity coefficient value?
A: For dilute solutions, γ± is typically close to 1. For concentrated solutions, it can be significantly less than 1.
Q3: How is mean ionic activity different from molality?
A: Mean ionic activity accounts for non-ideal behavior in solutions, while molality is just the formal concentration.
Q4: Why use molality instead of molarity?
A: Molality is temperature-independent as it's based on mass of solvent, not volume of solution.
Q5: Can this calculator be used for other electrolyte types?
A: This specific formula is for 1:1 electrolytes. Different formulas apply for other charge types.