Question

Black coffee has a pH of around 5. Since pH and pOH have an inverse relationship, black coffee has a pOH of ___.

Answer 1

pOH = 9.

Step-by-step explanation:

The inverse relationship between the pH and pOH of any given solution can be written as:

pH = 14 - pOH

Or conversely:

pOH = 14 - pH

With the above information in mind we can use the given pH to calculate the pOH:

pOH = 14 - pH

pOH = 14 - 5

pOH = 9

Thus, black coffee has a pOH of 9.