A gas that has a volume of 30 liters, a temperature of 46.0 C, and an unknown pressure has its volume increased to 36 liters and its temperature decreased to 35.0 C. The pressure after the change is 2.50 atm. What was the original pressure of the gas?

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.