Yesterday your friend made 1 gallon of dark pink paint using the information in the table. Today she needs to make 3 more gallons of the same shade. She says that she should add 9 parts red tint and 2 parts white tint to 3 gallons of base paint. Explain the error in her reasoning.

a. hope i'm right

explanation:

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.