Solutions of each of the hypothetical acids in the following table are prepared with an initial concentration of 0.100 M. Which of the four solutions will have the lowest pH and be most acidic? $$\begin{array} { c c }
\text { Acid } & \mathbf { p } \boldsymbol { K } _ { \mathbf { a } } \
\mathrm { HA } & 4.00 \
\mathrm { HB } & 7.00 \
\mathrm { HC } & 10.00 \
\mathrm { HD } & 11.00
\end{array}$$

Question

Solutions of each of the hypothetical acids in the following table are prepared with an initial concentration of 0.100 M. Which of the four solutions will have the lowest pH and be most acidic? $$\begin{array} { c c } 
\text { Acid } & \mathbf { p } \boldsymbol { K } _ { \mathbf { a } } \
\mathrm { HA } & 4.00 \
\mathrm { HB } & 7.00 \
\mathrm { HC } & 10.00 \
\mathrm { HD } & 11.00
\end{array}$$

Quizplus · Accepted Answer

The acid with the lowest pKa value is the strongest acid, which means it will dissociate more in solution, resulting in a higher concentration of hydrogen ions and thus a lower pH. HA has the lowest pKa value of 4.00, making it the most acidic.

Solutions of Each of the Hypothetical Acids in the Following