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What is the relationship between pKa and Ka?

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Question: What is the relationship between pKa and Ka?

Options:

  1. pKa = -log(Ka)
  2. pKa = log(Ka)
  3. pKa = Ka
  4. pKa = 1/Ka

Correct Answer: pKa = -log(Ka)

Solution: 

The relationship is given by pKa = -log(Ka), where Ka is the acid dissociation constant.

What is the relationship between pKa and Ka?

Practice Questions

Q1
What is the relationship between pKa and Ka?
  1. pKa = -log(Ka)
  2. pKa = log(Ka)
  3. pKa = Ka
  4. pKa = 1/Ka

Questions & Step-by-Step Solutions

What is the relationship between pKa and Ka?
  • Step 1: Understand that Ka is a number that tells us how strong an acid is. It is called the acid dissociation constant.
  • Step 2: Know that pKa is a way to express the strength of an acid in a different form.
  • Step 3: The relationship between pKa and Ka is given by the formula: pKa = -log(Ka).
  • Step 4: This means that to find pKa, you take the logarithm (log) of Ka and then change its sign (make it negative).
  • Step 5: A smaller pKa value means a stronger acid, while a larger pKa value means a weaker acid.
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