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Relation Between Ka & Kb Video Lecture | Physical Chemistry for NEET

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1. What is the relation between Ka and Kb?

Ans. Ka and Kb are related to each other through the ionization constant, Kw, of water. Kw represents the equilibrium constant for the autoionization of water into hydronium (H3O+) and hydroxide (OH-) ions. The relationship between Ka and Kb can be described by the equation Kw = Ka * Kb.

2. How are Ka and pKa related?

Ans. Ka and pKa are related logarithmically. The pKa value of an acid is the negative logarithm (base 10) of its Ka value. Mathematically, pKa = -log10(Ka). The pKa value provides information about the strength of an acid. The lower the pKa value, the stronger the acid.

3. What does a high Ka value indicate?

Ans. A high Ka value indicates a strong acid. The Ka value represents the acid dissociation constant, which measures the extent to which an acid dissociates or ionizes in water. A higher Ka value means greater ionization and a stronger acid.

4. How does temperature affect Ka and Kb values?

Ans. Temperature can affect the values of Ka and Kb. Generally, as the temperature increases, the values of Ka and Kb also increase. This is because higher temperatures provide more thermal energy, leading to increased molecular movement and greater ionization of acids and bases.

5. How can Ka and Kb be used to determine acid-base strength?

Ans. Ka and Kb values can be used to determine the relative strengths of acids and bases. The larger the Ka value, the stronger the acid, while the larger the Kb value, the stronger the base. By comparing the Ka or Kb values of different substances, their relative acid-base strengths can be determined.

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