Final answer:
To find the Ka value of hydrofluoric acid (HF) using the given information, we can use the Henderson-Hasselbalch equation to calculate the ratio of base/acid. By rearranging the equation and solving for the concentration of F, we can determine the Ka value.
Step-by-step explanation:
The Ka value of HF, hydrofluoric acid, can be determined using the given information. Since the concentration of HF is 1 M and the Ka is 6.6 x 10-4, we can use the Henderson-Hasselbalch equation to find the ratio of base/acid. The ratio should be equal to 0.66. By rearranging the equation and solving for the concentration of F, we can calculate the Ka value.