9. What is the pH of a 0.25 molar HBz (benzoic acid) solution. Ka HBz=6.5 x10-5​

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

How many liters of ethylene glycol antifreeze (c2h6o2), with a density of 1.100 g/l, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to - 21.5°c? for water, kf = 1.86°c m -1.