Acidity and Basicity Constants

[Devyn Chun 3I]

I'm still a little confused about how to find and use these Ka and Kb constant values. What is the general trend? Is it that a higher Ka that it is a stronger acid and a lower Ka is a weaker acid?

[AashaK]

For Ka and Kb values, a high Ka value corresponds with a strong acid, while a high Kb value corresponds with a strong base.

[005801694]

To transfer between pKa and Ka, use the equation pKa= -log Ka. If pKa is large, it means that the acid is weak. If Ka is large, it means that the acid is strong. Ka measures the amount of dissociation by the acid and the more H+ the acid can donate, the stronger the acid.

[Jose Angelo Grajeda 2D]

Ka and Kb values occur when it is a weak acid or base. A higher Ka value is an indication of a stronger acid, with more hydronium ([H+]) present in solution. A higher Kb means that it is a stronger base. Ka * Kb = Kw = 10^-14, which is why when you find pKa or pKb (-log(Ka), etc.), the result is a positive value, on the pH scale from 1 to 14. Hope this helps!