Which of the following steps can be used to identify an acid-base reaction? (5 points) Check whether the products are an acid and a base. Check whether the reactants are an acid and a base. Check if the ions of two compounds exchange places. Check if one element replaces another element in a compound.

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more info ? ? i don't understand what the question is

explanation:

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.