Na2S2O3标准溶液的配制和标定有它的特殊性,反应中产生的I-在酸性溶液中易被氧化,I2易被日光照射分解和单质挥发。要确保整个过程的稳定性和准确度,必须着重过程的各个细节以及常规的滴定操作的必要调整,而达到要求。%Preparation and calibration of Na2S2O3 standard solution has its specificity. The I-produced in the reaction is easily oxidized in an acidic solution, and the I2 is easily decomposed by sunlight and singly volatilized. To ensure the stability and accuracy in entire process, the necessary adjustments of various details and the conventional titration operations must be focused to meet the requirements.
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