Hydrolysis Constant Formula:
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Definition: The hydrolysis constant (Kh) 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.
The calculator uses the formula:
Where:
Explanation: The hydrolysis constant is calculated by dividing the ionic product of water by the base ionization constant.
Details: Knowing Kh helps predict whether a salt solution will be acidic, basic, or neutral, which is crucial in chemical analysis and buffer preparation.
Tips: Enter Kw (default 1×10-14) and Kb of the weak base (default 1.77×10-5 for ammonia). 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 do I find Kb for a base?
A: Kb values are typically found in chemistry reference tables or determined experimentally.
Q3: What does a higher Kh value indicate?
A: A higher Kh 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 (Kb is very large), making Kh negligible.
Q5: How is Kh related to pH?
A: Kh can be used to calculate the pH of a salt solution through the relationship with hydroxide ion concentration.