Whos having a good day and if not well too bad so sad

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Describe the forces both attractive and repulsive that occur as two atoms move closer together.

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.