किसी विलयन का `pH` `pH = (pK_(a_(1))+pK_(a_(2)))/(2)` द्वारा दिया जाता है। यह फार्मूला मान्य है

pH of some solution is given by pH = (pK_(a_(1))+pK_(a_(2)))/(2) . This formula is valid for the compound NaH_(2)BO_(3) .