1. What is Hydrolysis Constant?

Definition: The hydrolysis constant (K_h) is an equilibrium constant for a hydrolysis reaction, particularly important for weak base salts.

Purpose: It helps determine the extent of hydrolysis of a salt in aqueous solution and the resulting pH.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( K_h \) — Hydrolysis constant
• \( K_w \) — Ionic product of water (1×10^-14 at 25°C)
• \( K_b \) — Base ionization constant of the weak base

Explanation: The hydrolysis constant is calculated by dividing the ionic product of water by the base ionization constant.

3. Importance of Hydrolysis Constant

Details: Knowing K_h helps predict whether a salt solution will be acidic, basic, or neutral, which is crucial in chemical analysis and buffer preparation.

4. Using the Calculator

Tips: Enter K_w (default 1×10^-14) and K_b of the weak base (default 1.77×10^-5 for ammonia). 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 do I find K_b for a base?
A: K_b values are typically found in chemistry reference tables or determined experimentally.

Q3: What does a higher K_h value indicate?
A: A higher K_h means greater hydrolysis occurs, resulting in a more significant pH change in solution.

Q4: Can this calculator be used for strong bases?
A: No, because strong bases completely dissociate (K_b is very large), making K_h negligible.

Q5: How is K_h related to pH?
A: K_h can be used to calculate the pH of a salt solution through the relationship with hydroxide ion concentration.