A fuel mixture used in the early days of rocketry consisted of two liquids, hydrazine (n2h4) and dinitrogen tetroxide (n2o4) which ignite on contact to form nitrogen gas and water vapor.

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.

c. 4.54 x 10–12 j happens to be correct