If the Molarity concentration of an acid is
The Molarity is the Concentration [ ]. While your question does not distinguish which concentration is represented I will assume for our purposes the the
To convert a Molarity concentration to pH we can calculate
Now, pH + pOH = 14, so pOH = 14 - pH
Then we can convert the
Moving the decimal gives us a value of
Some checkpoints to see if your calculations are correct.
The exponents of the concentrations should add up to -15.
-12 and -3 give us a value of -15
The pH should value of the pH and pOH should be less than the exponents of the concentrations.
pH = 11.27 < 12
pOH = 2.73 < 3