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Ionic Product of Water given Constant of Hydrolysis and Acid Ionization Constant of Weak Acid Calculator

Formula Used:

\[ K_w = K_a \times K_h \]

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1. What is Ionic Product of Water?

Definition: The ionic product of water (Kw) is the mathematical product of the concentration of hydrogen ions and hydroxide ions in water or aqueous solutions.

Purpose: This calculator determines Kw from the acid ionization constant (Ka) and hydrolysis constant (Kh) of a weak acid.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ K_w = K_a \times K_h \]

Where:

Explanation: The relationship shows how the self-ionization of water connects with acid-base equilibrium constants.

3. Importance of Ionic Product of Water

Details: Kw is fundamental in determining pH and understanding acid-base chemistry in aqueous solutions.

4. Using the Calculator

Tips: Enter the acid ionization constant (Ka) and hydrolysis constant (Kh). Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical value of Kw at 25°C?
A: At standard conditions, Kw is approximately 1.0 × 10-14.

Q2: How does temperature affect Kw?
A: Kw increases with temperature as the autoionization of water is endothermic.

Q3: What are typical units for Ka and Kh?
A: Both constants are typically unitless as they represent equilibrium constants.

Q4: Can this calculator be used for strong acids?
A: No, this relationship specifically applies to weak acids and their conjugate bases.

Q5: How is Kh related to Kb?
A: Kh = Kw/Ka = Kb for the conjugate base.

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