PLEASE SHOW WORK
1) You have a solution of acetic acid that has a K a of 3.5 × 10 –8 . If the concentration of the acetic acid were 2.40 M, what would be the concentration of H + at equilibrium?
2) You have a solution that is 1.75 M HCN. If the K a is 9.9 × 10 –8 , calculate the pH of the solution.
3) How many grams of KOH are needed to neutralize 35.0 mL of 1.8 M HCl?
4) How many mL of 2.20 M KOH are needed to neutralize 20.0 mL of 1.40 M HNO 3 ?

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

When would a bouncy ball have the most potential energy