Below what pH will free phenobarbital begin to separate from a solution having an initial concentration of 4 g of sodium
phenobarbital per 100 mL at 25°. The molar solubility of
phenobarbital is 0.0050 and the pKa is 7.41 at 25°C. The molecular
weight of sodium phenobarbital is 254

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?