pKa from Ka Calculator (Ka to pKa converter)

How to use K_a to pK_a calculator?

Using the above calculator you can easily convert the K_a value to pK_a.

• Enter a K_a value in the input field labeled “K_a value =”.
• Click the “Calculate” button.
• The result [pK_a] will be displayed in the “result” section with Step by Step solution.

Note: Most of the time the K_a value given in the problem is represented in scientific notation, for example, 5.49 × 10^-8, 2.33 × 10^-11, etc. 

These values can also be written as – 

⇒ 5.49 × 10^-8 = 5.49e-8

⇒ 2.33 × 10^-11 = 2.33e-11

So, in the “K_a to pK_a calculator” put the value of K_a which is given in scientific notation as described above like [5.49e-8, 2.33e-11].

How to calculate pK_a from K_a?

pK_a is the negative logarithm of K_a to the base 10 as shown in the formula given below:

∴ pK_a = -log₁₀(K_a)

Example of calculating pK_a value using “K_a to pK_a calculator”

Let’s say we have given the value of K_a and we need to calculate the pK_a value.

For example – If the K_a value = 1.34 x 10^-5, what is the [pK_a] value?

As we know, the formula to convert K_a to pK_a is –

∴ pK_a = -log₁₀(K_a)

Note:- As the given K_a value in scientific notation which is 1.34 x 10^-5, this value can also be written as “1.34e-5”.

So, Just put this value of [K_a] in the calculator field, and press calculates button to get step by step solution.

∴ So, the approx pK_a value for given K_a is 4.87.

Numericals based on “Converting pK_a value to K_a“

Also, check

• pK_a to K_a calculator