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我们在实际工作中或无机化学、分析化学教学中,经常碰到这样的问题:计算在有同离子存在的情况下,难溶物质的溶解度。通常,我们在计算中都是采用简化公式,即忽略难溶物质所溶解的那部分同离子。但是,在某些情况下,难溶物质所溶解的那部分同离子的作用必须考虑。例如:当难溶物质的溶度积较大,且同离子浓度又不太高时,忽略溶解度的影响将带来很大的误差。因此在这种情况必须进行严格计算。
In practical work or inorganic chemistry, analytical chemistry teaching, we often encounter such a problem: in the presence of the same ion to calculate the solubility of insoluble substances. In general, we use the simplified formula in our calculations to ignore the portion of the same ions that the insoluble material dissolves. However, in some cases, the role of that part of the ion that the insoluble substance dissolves in must be considered. For example: when the insoluble product of the solubility product is large, and the same ion concentration is not too high, ignoring the impact of solubility will bring great error. So in this case must be strictly calculated.