Calculate the base dissociation constant,Kb,for the fluoride ion,F- .

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Explanation: 

Kb for the F- is not included in the table.However the Ka for its conjugate acid HF , is given in table as Ka = 6.8 x 10-4 .We can therefor use equation to calculate Kb :

Kw = Ka x Kb

1.0 x 10-14 = Ka x Kb

Kb = 1.0 x 10-14 / 6.8x 10-4 = 1.5 x 10-11

Answer: 

1.5 x 10-11