Anna took a large, jagged rock down to the river near her home and placed it in the water where the water was moving very fast. She went back to check the rock several months later. What changes will Anna observe in her rock?

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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.