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                            干燥剂为什么能干燥物品

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                            干燥剂为什么能干燥物品

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                            干燥剂为什么能干燥物品

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                            干燥剂为什么能干燥物品

                            干燥剂的吸水能力和三个因素相关。一是每克干燥剂能吸收多少水;二是吸水的速度,例如对于流动气体的干燥,要求干燥剂吸水的速度足够地快;三是所干燥的体系中剩余的水分或空气中水蒸气的蒸汽压。所干燥的体系中剩余的水分越少,或者空气中水蒸气的蒸汽压越低,干燥剂的吸水能力越强。由于干燥剂的吸水性再强也不可能百分之百地去除水分,所以增加干燥剂的用量并不一定能够使吸水更加彻底。例如,无水硫酸钠是一种吸水能力很强的干燥剂(它吸水生成水合物Na2SO4⋅10H2O),但是吸水的速度比较慢,除水也不够彻底。而无水硫酸钙的吸水能力较低(生成的水合物为CaSO4⋅2H2O),但是吸水的速度和除水彻底性都比较好。

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