How do you use Henderson-Hasselbalch equation to calculate pH?

Henderson-Hasselbalch Equation

1. Henderson-Hasselbalch Equation.
2. The equation can be rewritten to solve for pOH:
3. [ B ] = molar concentration of a weak base (M)
4. pH = pKa + log ([A-]/[HA])
5. pH = -log (1.8 x 10-5) + log (2.5)

What does the Henderson-Hasselbalch equation tell us about pH?

The Henderson-Hasselbalch equation is useful for estimating the pH of a buffer solution and finding the equilibrium pH in an acid-base reaction. The equation can be used to determine the amount of acid and conjugate base needed to make a buffer solution of a certain pH.

How do you calculate the pH of a buffer solution with pKa?

Our buffer pH calculator will help you painlessly compute the pH of a buffer based on an acid or a base….How to calculate the pH of a buffer solution?

1. pH = -log₁₀(H);
2. Ka – acid dissociation constant ;
3. [HA] – concentration of the acid;
4. [A⁻] – concentration of conjugate base; and.
5. pKa = -log₁₀(Ka).

How do you calculate pH of a buffer?

To calculate the specific pH of a given buffer, you need to use the Henderson-Hasselbalch equation for acidic buffers: “pH = pKa + log10([A-]/[HA]),” where Ka is the “dissociation constant” for the weak acid, [A-] is the concentration of conjugate base and [HA] is the concentration of the weak acid.

Does the Henderson-Hasselbalch equation work for bases?

The Henderson-Hasselbalch equation is valid when it contains equilibrium concentrations of an acid and a conjugate base. In the case of solutions containing not-so-weak acids (or not-so-weak bases) equilibrium concentrations can be far from those predicted by the neutralization stoichiometry.

What is the Henderson Hasselbalch equation for pH?

Henderson-Hasselbalch Equation. The Henderson-Hasselbalch equation relates pH, pKa, and molar concentration (concentration in units of moles per liter): pH = pKa + log ([A-]/[HA]) [A-] = molar concentration of a conjugate base.

What is the Henderson-Hasselbalch approximation?

The Henderson-Hasselbalch approximation allows us one method to approximate the pH of a buffer solution. The basic equation is as follows: We have straightforward calculations for strong acids and bases, but the computations behind buffers are rather complex and time consuming.

How do you find the pH of a buffer solution?

The pH of a buffer solution can be estimated with the help of this equation when the concentration of the acid and its conjugate base, or the base and the corresponding conjugate acid, are known. The Henderson-Hasselbalch equation can be written as: pH = pK a + log 10 ([A –]/[HA])

How do you modify Henderson’s equation?

He eventually modified Henderson’s equation by putting mathematical logs into it creating a solid relationship. For a weak acid H A and its conjugate base A −: