Which of these correctly defines the poh of a solution?
the log of the hydronium ion concentration
the negative log of the hydronium ion concentration
the log of the hydroxide ion concentration
the negative log of the hydroxide ion concentration

I believe it is D) the negative log if the hydrixide ion concentration

The correct answer is:

The negative log of the hydroxide ion concentration.

Explanation:

The pOH is a standard of hydroxide ion (OH-) concentration. pOH is a step of the alkalinity of a solution. Aqueous solutions at 25°C with pOH less than 7 are alkaline, pOH greater than 7 are acidic and pOH equal to 7 are neutral.pOH scale can be determined as follows

pOH = -log[OH⁻]

[OH⁻] is the hydroxide ion concentration,therefore pOH is the negative log of the hydroxide ion concentration

your picture is not part of the scientific method.

the atomic mass is the bottom number on the element.

-steel jelly