Answer:
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth.
The answer is 1 polonium and radium
Relationship between [H3O+] and [OH-] is:
[H3O+] X [OH-] = 1.00 X10^-14
Rearranging gives:
[H3O+] = 1.0X10^-14 / [OH-]
Just plug in and calculate your [H3O+] values