The actual value for absolute zero in degrees Celsius is −273.15. Use the formula below to determine your percent error for both gas samples. |experimental value – actual value| x 100
actual value
I don't understand the question , or how to do it.

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.