Ka from pka Calculator (pka to ka converter)

The formula to calculate K_a from the pK_a value is –

∴ K_a = 10^-pKa

pKa to Ka calculator

pK_a to K_a Calculator

pK_a value =

[K_a] =

How to use pK_a to K_a calculator?

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

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

How to calculate K_a from pK_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)

Above equation can be transferred by taking antilog –

∴ K_a = 10^-pKa

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

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

For example – If the pK_a value = 3.14, what is the [K_a] value?

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

∴ K_a = 10^-pKa

So, just put the value of pK_a in the respective field and then press calculate button.

∴ So, The acid dissociation constant (K_a) for the given pK_a value is 0.000724 or 7.24 x 10^-4.

Numericals based on “Converting pK_a value to K_a“

What is the value of the acid dissociation constant (K_a) for the acidic solution, given its pK_a value of 11.62?

To find the value of the acid dissociation constant (K_a) for the acidic solution, we can use the equation given below –

⇒ K_a = 10^-pKa

We have given, the pK_a value which is 11.62

∴ [K_a] = 10^-11.62

= 2.40 x 10^-12

So, the acid dissociation constant (K_a) for the given pK_a value is 2.40 x 10^-12

The pK_a for acetic acid is 4.80. What is the K_a value for acetic acid?

As the pK_a value for acetic acid is given in the question statement. So we can substitute it into the equation given below to find K_a as follows.

∴ K_a = 10^-pKa

∴ K_a = 10^-4.80 = 1.58 x 10^-5.

So, the acid dissociation constant (K_a) value for the given pK_a of acetic acid is 1.58 x 10^-5.

Also, check

K_a to pK_a calculator

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About the author

Vishal Goyal

Vishal Goyal is the founder of Topblogtenz, a comprehensive resource for students seeking guidance and support in their chemistry studies. He holds a degree in B.Tech (Chemical Engineering) and has four years of experience as a chemistry tutor. The team at Topblogtenz includes experts like experienced researchers, professors, and educators, with the goal of making complex subjects like chemistry accessible and understandable for all. A passion for sharing knowledge and a love for chemistry and science drives the team behind the website. Let's connect through LinkedIn: https://www.linkedin.com/in/vishal-goyal-2926a122b/

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