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Calculate for 0.01 N Solution of Ch3co2na Hydrolysis Constant

Reviewed by Calculator Editorial Team

This calculator helps determine the hydrolysis constant (Kh) for a 0.01 N solution of sodium acetate (CH3CO2Na). The hydrolysis constant is a measure of how much the salt dissociates in water, affecting the solution's pH.

Introduction

Sodium acetate (CH3CO2Na) is a weak salt that undergoes hydrolysis when dissolved in water. The hydrolysis reaction can be represented as:

CH3CO2Na + H2O ⇌ CH3CO2H + NaOH

The hydrolysis constant (Kh) is defined as the equilibrium constant for this reaction. It quantifies the extent to which the salt dissociates in water, which in turn affects the solution's pH.

Formula

The hydrolysis constant (Kh) for a weak salt can be calculated using the following formula:

Kh = [CH3CO2H][NaOH] / [CH3CO2Na]

Where:

  • [CH3CO2H] is the concentration of acetic acid formed
  • [NaOH] is the concentration of sodium hydroxide formed
  • [CH3CO2Na] is the initial concentration of sodium acetate

Calculation

For a 0.01 N solution of CH3CO2Na, we can use the following steps to calculate the hydrolysis constant:

  1. Determine the initial concentration of CH3CO2Na: 0.01 M
  2. Assume complete dissociation of the salt: [CH3CO2Na] = 0.01 M
  3. Let x be the amount of salt that hydrolyzes: [CH3CO2H] = [NaOH] = x
  4. Set up the equilibrium expression: Kh = x² / (0.01 - x)
  5. For small x, approximate Kh ≈ x² / 0.01
  6. Solve for x: x = √(Kh × 0.01)

Using standard values, the hydrolysis constant for CH3CO2Na is approximately 1.8 × 10-5.

Interpretation

The calculated hydrolysis constant provides insight into the behavior of the solution:

  • A higher Kh indicates more dissociation and a lower pH
  • A lower Kh indicates less dissociation and a higher pH
  • The pH of the solution can be estimated using the Kh value

Note: The actual pH of the solution will depend on the buffer capacity and other factors, but the hydrolysis constant provides a fundamental measure of the salt's behavior in water.

FAQ

What is the difference between Kh and Ka?

Kh is the hydrolysis constant for a salt, while Ka is the acid dissociation constant for an acid. Both measure equilibrium constants but for different reactions.

How does temperature affect the hydrolysis constant?

The hydrolysis constant is temperature-dependent. Higher temperatures generally increase the rate of hydrolysis but may not significantly change the equilibrium constant itself.

Can I use this calculator for other weak salts?

This calculator is specifically designed for sodium acetate. For other weak salts, you would need to adjust the formula and constants accordingly.