Which has the least gravitational potential energy? a 25 kg barbell above the head of a weightlifter or a 10 kg barbell resting on the floor

dont worry about it go do some lifting for yourself and find out

Explanation:

e

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.