# At 25 °C, how many dissociated H+ ions are there in 341 mL of an aqueous solution whose pH is 11.39?

Approximately $8.36 \cdot {10}^{11}$ dissociated ${H}^{+}$ ions are in the described solution.
${10}^{- 11.39} \approx 4.07 \cdot {10}^{-} 12 M$
$\frac{4.07 \cdot {10}^{-} 12 m o l}{L} \cdot 0.341 L \cdot \frac{6.02 \cdot {10}^{23} i o n s}{m o l} \approx 8.36 \cdot {10}^{11} i o n s$