k+ RT In a outer glass =K+0.05911ga outer k-0.0591pH (6-10) Glass electrode unknown solution SCE E +e ce ell ESCE +EL -K+0.0591pH K"+0.0591DH (6-111 cel O.0591 (6-12)K pH E E K pH E E E E SCE Lj cell ref glass Lj ' 0.0591 0.0591 = + = + − + = − + K pH K E k outer f R T glass inner outer 0.0591 0.0591lg ln = − = + = +    Glass electrode︱unknown solution ︱SCE 0.0591 E K' pH cell − = (6-10) (6-11) (6-12)