The ones that are able to survive pass on their genes to the next generation. Bye doing that they pass on certain traits to the next generation causing them to inherit those traits and develop new ones and that prosses repeats for thousands and millions of years and that's how they are able to evolve.
PH: 4.80617997
pOH: 9.1938200
[H+]: 1.562
[OH-] 6.4E-10
Acid
Empirical formula is a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
so, in this case :
ratio of x to y is 6:3 or 2:1 . Empirical formula would be