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QUESTION

# How to determine the strong base and weak base?

The K_b determines if a compound is a weak base or a strong base.

A strong base dissociates completely in solution (has a K_b ≫ 1).

A weak base dissociates slightly in solution (has a K_b ≪ 1).

A base can be a strong base, even if it contributes only a few ions to the solution.

Thus, "NaOH" is a strong base because it dissociates completely:

"NaOH(aq)" → "Na"^+"(aq)" + "OH"^"-""(aq)"

If you dissolve 10^"-8" color(white)(l) "mol of NaOH" in 1 L of water, it will contribute only 10^"-8"color(white)(l) "mol" of "OH"^"-" ions, but that is 100 % of what it has to give.

"NaOH" is a strong base. Its strength does not depend on its concentration.