Calculate the hydrogen ion concentrations in soulutions having the following PH values: a) 4.

*plz I need the answer asap*​

If 1.8 l of water is added to 2.5l of a 7.0 molarity koh solution, what is the molarity of the new solution

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering