碘化钾试剂的配制与保存条件的热力学分析

The Thermodynamic Analysis of Preparation and Storage Conditions of Potassium Iodide Reagent

碘化钾是化学实验常用的试剂,在使用中其溶液在空气中遇到氧气容易被氧化成碘单质,在酸性条件下氧化更快.经过理论计算表明,配制碘化钾溶液时加入适量的结晶碳酸钠,可使碘离子在碱性环境下稳定存在,能长期保存.

Potassium iodine is a commonly used reagent in chemical experiments.It is found that its solution is easily oxidized to iodine when it meets oxygen in the air,and it oxidized faster under acidic conditions.The theoretical calculation showed that the iodine ion could exist stably in alkaline environment and could be preserved for a long time by adding appropriate amount of crystalline sodium carbonate to the preparation of potassium iodide solution.