The is a measure of how acidic or basic a solution is.

ph level- helps to measure of how acidic, basic, neutral  a solution. ph scale extends from 0 to 14.  Substances with a ph less than 7 are considered acidic, those with a ph greater than 7 are basic, and those with ph of 7 are neutral.

The pH [level] is a measure of how acidic or basic a solution is.

Explanation:

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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.

i think the answer is terrae but not 100 percent sure. ▓▬▬ §