The strength of an acid or base depends on the degree on of ionization in water. the graph represents a

HA in the graph represents a weak acid.

Explanation

Is HA an acid or a base?

Apply the Arrhenius Theory of Acids and Bases.

Acids ionize in water to produce (or equivalently ) and a conjugate ion.Bases ionize in water to produce and a conjugate ion.

The equation in the picture shows that HA ionizes in water to produce ions. By the Arrhenius Theory of acids and bases, HA is an acid.

Is HA a weak acid or a strong acid?

Both weak and strong Arrhenius acids ionize in water to produce (or equivalently ) and a conjugate ion. However,

Strong acids ionize completely. There would be nearly no acid left in the solution. Expect arrows ⇒ in only one direction in the equation.Weak acids also ionize, but only partially. There would be plenty of acid left in the solution. Expect two-sided arrows like ⇔ and two-sided harpoons like in the equation.

As seen in the bar chart, there are plenty of HA left after ionization. HA ionizes only partially. Also, the equation shows a two-sided arrow. As a result, HA is a weak acid.

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