To determine the order of conductivity of the acidic solutions based on their pH values, we need to consider that lower pH values indicate higher acidity and a greater concentration of hydrogen ions (H⁺) in the solution.
The pH values provided are:
- HA: pH 5.6
- HB: pH 3.9
- HC: pH 4.7
The order of acidity (and therefore conductivity, as more conductive acids dissociate more in solution) is as follows:
- HA (pH 5.6) - least conductive
- HC (pH 4.7)
- HB (pH 3.9) - most conductive
Thus, the order from least conductive to most conductive is: HA, HC, HB
The correct answer is: HA, HC, HB