When you have a different isotope of the same element, what is changed O height
O volume
O mass
O periodic table alignment

mass

Explanation:

An isotope is an element with different numbers of neutrons.  Changing the number of neutrons won't affect the height, volume, or periodic table alignment.  It will only affect the mass.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

the answer is minerals.