Question

What is the relationship between Ka and Kb with Kw?

The sum of  Ka

 and  Kb  equals the auto-dissociation constant for water. The product of  K a  and  K b  equals the auto-dissociation constant for water. The quotient of  K a  and  K b  equals the auto-dissociation constant for water. The difference of  K a  and  K b  equals the auto-dissociation constant for water.

Answer 1

The correct answer is ...... The product of Ka and Kb equals the auto-dissociation constant for water. I know its right for sure!

Answer 2

Answer is: The product of Ka and Kb equals the auto-dissociation constant for water.

Reaction of auto-dissociation for water: H₂O ⇄ H⁺ + OH⁻.

Water dissociates (autoionization) to form hydrogen ions (H⁺) and hydroxide (OH⁻) ions. The protons (H⁺) hydrate as hydroxonium ions( H₃O⁺).

The Kw (the ionic product for water) at 25°C is 1·10⁻¹⁴ mol²/dm⁶ or 1·10⁻¹⁴ M². Concentration of hydrogen ions and hydroxide ions in pure water are the same.

Ka · Kb = Kw; the ionic product of water.