Question

pOH of a solution is 7.8 what is the pH​

Answer 1

Answer:

pH and pOH are the log concentrations of protons and hydroxide ions, respectively.

pH=−log[H+]

pOH=−log[OH−]

The sum of pH and pOH is always 14. This is because the product of proton concentration and hydroxide concentration must always equal the equilibrium constant for the ionization of water, which is equal to 10−14.

H2O⇌H++OH− Keq=[H+][OH−]=10−14

−log(10−14)=−log[H+]+−log[OH−]

14=pH+pOH

In this question, we know that the pOH is equal to 7.8, allowing us to solve for the pH.

pH=14−pOH

pH=14−7.8 = 6.2