论文部分内容阅读
本文通过理论分析和计算探讨了0~100℃范围内不同温度下的碳酸平衡问题,分析了H2CO3*、HCO3-和CO32-三种碳酸在不同温度和pH条件下的水中所占比例及分布规律。认为0~100℃范围内pH0在8.60~8.22之间变化,变化范围较小;三种碳酸在不同温度下随pH变化过程中所占比例存在差异,但差异也不大;在0~100℃范围内不管温度高低,均表现出酸性水中H2CO3*占优势,碱性水中CO32-占优势,偏酸、偏碱及中性水中HCO3-占优势;在较低pH下由于水中CO32-含量很少,因此用常规方法一般是难以检测到的。
This paper discussed the equilibrium of carbonic acid at different temperatures in the range of 0 ~ 100 ℃ by theoretical analysis and calculation, and analyzed the proportion and distribution of the three kinds of carbonic acid under different temperatures and pHs in the water of H2CO3 *, HCO3- and CO32- . It is considered that the pH0 varies from 8.60 to 8.22 in the range of 0-100 ℃ and the range of variation is small. The proportions of the three kinds of carbonic acid in the process of pH change at different temperatures are different, but the difference is not large. No matter the temperature is high or low, H2CO3 * is dominant in acidic water, CO32- is dominant in alkaline water, partial acid, partial alkali and HCO3- in neutral water are predominant; at low pH, CO32- is low , It is generally difficult to detect by conventional methods.