Respuesta :
The base dissociation constant (Kb) determines the ions of the base dissociated into the aqueous solution. Kb for CN⁻ ion will be 2.0 × 10⁻⁵. Thus, option D is correct.
What is the base dissociation constant?
The base dissociation constant (Kb) is the measurement of the ions that a base can dissociate and dissolve in the aqueous solution. The higher the value of the base dissociation constant the higher will be its basicity and strength.
The dissociation reaction of hydrogen cyanide is shown as,
HCN → H⁺ + CN⁻
Given,
Ka for HCN = 4.9 x 10⁻¹⁰
The correlation between acid dissociation constant and base dissociation constant is given as,
Kw = Ka × Kb
Substituting values,
Kb = Kw ÷ Ka
= (1 × 10⁻¹⁴) ÷ (4.9 × 10⁻¹⁰)
= 2.0 × 10⁻⁵
Therefore, option D. 2.0 × 10⁻⁵ is the base dissociation constant (Kb) for cyanide ions.
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