The optimum ph of a swimming pool is 7.39. calculate the value of [h3o+] and [oh-] at this ph. lol

Why are people not able to scuba dive in the deep part of the ocean

What can be found in the ionosphere

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.