Which reactions are oxidation-reduction reactions? Check all that apply. FeS(s) + 2HCl(aq) → H2S(g) + FeCl2(g) AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3 2C3H6(g) + 9O2(g) → 6CO2(g) + 6H2O(g) Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)

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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.