- ( ), 1 + ? , 1 - , 1/n n . . ., H2SO4+2NaOH=Na2SO4+2H2O 1 + 1 NaOH ( 40), 1 ? - 1/2 H2SO4 ( 98); NaOH 40, H2SO4 - 49, . . 98/2.