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NaOHis titrated with H2SO4titrantand the end-point is defined at pH7.0 (1). Dispense Na2SO3solution to produce NaOH equivalent to formalin(2). FinallyNaOHis quantified by titrating with H2SO4titrant (1).2NaOH + H2SO4Na2SO4+ 2H2O HCHO + Na2SO3+ H2O CH2(OH)SO3Na + NaOH ・・・(1)・・ NaOH in electroless copper plating solution is titrated with H2SO4 titrant until the end point is defined at pH 7.0 (1). Next, dispense Na2SO3 solution to produce NaOH equivalent to formalin (2). Finally NaOH is quatified by titrating with H2SO4 titrant (1). 2NaOH + H2SO4 Na2SO4 + 2H2O ・・・ (1) HCHO + Na2SO3 + H2O CH2(OH)SO3Na + NaOH ・・・ (2)
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