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

Hydrolysis Constant Formula:

\[ K_h = \frac{K_w}{K_a} \]

Hydrolysis Constant (K_h):

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1. What is Hydrolysis Constant?

Definition: The hydrolysis constant (K_h) is an equilibrium constant for a hydrolysis reaction where water reacts with a dissolved salt to form an acid or base.

Purpose: It helps chemists understand and predict the extent of hydrolysis reactions in aqueous solutions.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ K_h = \frac{K_w}{K_a} \]

Where:

\( K_h \) — Hydrolysis constant
\( K_w \) — Ionic product of water (1×10^-14 at 25°C)
\( K_a \) — Acid ionization constant of the weak acid

Explanation: The hydrolysis constant is calculated by dividing the ionic product of water by the acid dissociation constant.

3. Importance of Hydrolysis Constant

Details: The hydrolysis constant helps determine the pH of salt solutions and predicts whether a solution will be acidic, basic, or neutral.

4. Using the Calculator

Tips: Enter the ionic product of water (default 1×10^-14) and the acid ionization constant. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical value of K_w?
A: At 25°C, K_w is 1×10^-14, but it varies with temperature.

Q2: How does K_a affect K_h?
A: The weaker the acid (smaller K_a), the larger the hydrolysis constant.

Q3: What does a high K_h value indicate?
A: A high K_h indicates extensive hydrolysis occurs in the solution.

Q4: Can K_h be greater than 1?
A: Yes, when K_a is very small (very weak acid), K_h can be greater than 1.

Q5: How is this related to pH calculations?
A: K_h is used to calculate the pH of salt solutions formed from weak acids and strong bases.