Hydrolysis Constant Formula:
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Definition: The hydrolysis constant (Kh) 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.
The calculator uses the formula:
Where:
Explanation: The hydrolysis constant is calculated by dividing the ionic product of water by the acid dissociation constant.
Details: The hydrolysis constant helps determine the pH of salt solutions and predicts whether a solution will be acidic, basic, or neutral.
Tips: Enter the ionic product of water (default 1×10-14) and the acid ionization constant. All values must be > 0.
Q1: What is the typical value of Kw?
A: At 25°C, Kw is 1×10-14, but it varies with temperature.
Q2: How does Ka affect Kh?
A: The weaker the acid (smaller Ka), the larger the hydrolysis constant.
Q3: What does a high Kh value indicate?
A: A high Kh indicates extensive hydrolysis occurs in the solution.
Q4: Can Kh be greater than 1?
A: Yes, when Ka is very small (very weak acid), Kh can be greater than 1.
Q5: How is this related to pH calculations?
A: Kh is used to calculate the pH of salt solutions formed from weak acids and strong bases.