Determine which acid is stronger.

The pH scale indicates the acidity of a solution. A lower pH value corresponds to a higher concentration of hydrogen ions ($[\text{H}^+]$) and thus a stronger acid.
Given:
pH of HA = 0.8
pH of HB = 2.8
Since 0.8 is less than 2.8, HA has a lower pH.

a) HA

A stronger acid dissociates more completely in water, releasing a greater concentration of hydrogen ions ($\text{H}^+$ or $\text{H}_3\text{O}^+$). A