Ka from pka Calculator (pka to ka converter)

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The formula to calculate Ka from the pKa value is –

∴ Ka = 10-pKa

pKa to Ka calculator

pKa to Ka Calculator

[Ka] =

How to use pKa to Ka calculator?

Using the above calculator you can easily convert the pKa value to Ka.

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

How to calculate Ka from pKa?

pKa is the negative logarithm of Ka to the base 10 as shown in the formula given below:

∴ pKa = -log10(Ka)

Above equation can be transferred by taking antilog –

Ka = 10-pKa

formula to convert pKa to Ka

Example of calculating Ka value using “pKa to Ka calculator”

Let’s say we have given the value of pKa and we need to calculate the Ka value.

For example – If the pKa value = 3.14, what is the [Ka] value?

As we know, the formula to convert pKa to Ka is –

∴ Ka = 10-pKa

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

example of converting pka to ka

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

Numericals based on “Converting pKa value to Ka

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

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

⇒ Ka = 10-pKa

We have given, the pKa value which is 11.62

∴ [Ka] = 10-11.62

= 2.40 x 10-12

So, the acid dissociation constant (Ka) for the given pKa value is 2.40 x 10-12

The pKa for acetic acid is 4.80. What is the Ka value for acetic acid?

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

∴ Ka = 10-pKa

∴ Ka = 10-4.80 = 1.58 x 10-5.

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

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About the author

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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