What is the letter on the model titration curve of HPr that corresponds to the point where pH equals the numerical value of the pKa for HPr?

A.

It conforms what ever surface its in.

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .