When is a weak acid weak and when is a weak acid strong? Show that the weak

Question:

When is a weak acid weak and when is a weak acid strong? Show that the weak acid HA will be 92% dissociated when dissolved in water if the formal concentration is one-tenth of Ka (F = Ka/10). Show that the fraction of dissociation is 27% when F = 10Ka. At what formal concentration will the acid be 99% dissociated? Compare your answer with the left-hand curve.