# Henderson-Hasselbalch Calculator

Henderson-Hasselbalch Calculator determines the pH of a buffer solution quickly and effortlessly. This free tool takes conjugate base, acid, Ka details to give the concentration of the acid and conjugate base within it.

### Step by Step Process to Find pH

Go through the steps on how to calculate the pH of the solution easily.

- Get the conjugate base, acid, Ka details.
- Divide the conjugate base by the acid.
- Find the logarithm of the value
- Add it to the pKa to get the solution pH.

### Henderson-Hasselbalch Equation

The Henderson-Hasselbalch Equation to calculate the pH of the solution is as follows:

**pH = pKₐ + log([A⁻]/[HA])**

The parameters required to use the Henderson-Hasselbalch Calculator is along the lines:

[A⁻] is the molar concentration of the conjugate base

[HA] is the molar concentration of the acid

pK is the acid's dissociation constant

The pH formula is pH = -log(H).

A buffer solution contains a strong acid with a weak conjugate base, strong base with a weak conjugate acid.

In simple terms, the acid can be defined as the proton donor. The base is a proton acceptor.

**Example:**

**Question: A mixture of 0.2 M acetic acid and 0.3 M sodium acetate is given. Calculate the pH of the medium if pKa of the acid is 4.5.**

Answer:

Given that

The concentration of acetic acid = 0.2 M

The concentration of the acetate ion = 0.3 M

pka of aetic acid = 4.5

pH = pKₐ + log([A⁻]/[HA])

pH = 4.5 + log(0.3/0.2)

= 4.5 + log 1.5

= 4.5 + 0.18

= 4.68

The pH of the given solution is 4.68.

Chemistrycalc.Com has got calculators like Buffer Capacity, Buffer pH, Cell EMF and many more at one place.

### FAQ’s on Henderson-Hasselbalch Calculator

**1. What is the use of the Henderson-Hasselbalch equation?**

The Henderson-Hasselbalch equation is used for calculating the amount of acid or conjugate base to be required for preparing the buffer solution that has a specific pH.

**2. How to solve the Henderson-Hasselbalch equation without using a calculator?**

The Henderson-Hasselbalch equation is pH = pKₐ + log([A⁻]/[HA]). Place the values in the formula and solve to get the concentration of acid in a buffer solution.

**3. What is the pK value?**

pK is the measure of the strength of the acid on a logarithmic scale and it is used to compare the strength of various acids. pK = log(1/Ka). Here Ka is the acid dissociation constant.

**4. What is the relationship between pK and pKa?**

The simple relationship between the pK and pKa is pKa + pKb = 14.