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本法以氢氧化钾-乙醇标准溶液作吸收液,用冰醋酸-乙醇标准溶液作返滴定液测定碳酸盐。其优点是:避免了用氢氧化钾-乙醇标准溶液直接滴定时,由于滴定慢而引起二氧化碳的损失;采用两个吸收杯串联,可使二氧化碳吸收更趋完全;吸收液中配入百里酚酞作指示剂,便于密闭连续操作,且能随时判别吸收液是否足量。试剂配制碳酸钠标准溶液—配制成2毫克碳酸钠/毫升的碱性溶液;吸收液—2～3克氢氧化钾溶
This method to potassium hydroxide - ethanol standard solution for the absorption solution, with glacial acetic acid - ethanol standard solution for the back titration of carbonates. The advantages of the method are as follows: avoiding the loss of carbon dioxide due to slow titration when using potassium hydroxide-ethanol standard solution titration; using two absorption cups in series, the carbon dioxide absorption can be more completely completed; the absorption liquid is filled with thymolphthalein For indicators, to facilitate airtight continuous operation, and can always determine whether the absorption liquid sufficient. Reagent preparation of sodium carbonate standard solution - formulated into 2 mg sodium carbonate / ml of alkaline solution; absorption solution -2 to 3 grams of potassium hydroxide solution