Write the equilibrium constant expression for each of the following reactions.
a. C(s) + CO2(g) = 2 CO(g)
b. 2 C2H6(g) + 7 O2(g) = 6 H2O(g) +4 CO2 (g)
c. CaO(s) + SO3 (g) = CaSO4 (s)

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.