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96年全国高考上海化学试题第22题的命题“pH值为4的FeCl3溶液……”．是否存在PH值为4的FeCl3溶液呢？对于这个问题，我们不妨分析一下．在FeCl3溶液中存在水解平衡：Fe3＋＋3H2OFe（OH）3＋3H＋已知KspFe（OH）3＝4×10－38，Kw＝10×10－14设FeCl3溶液中[Fe3＋]＝0．1mol／L
The proposition of Question 22 of the Shanghai Chemical Exam Question in the 96th National Exam of the National University of the People’s Republic of China was “FeCl3 solution with a pH of 4 ...”. Is there a FeCl3 solution with a pH of 4? For this issue, we may wish to analyze. There is a hydrolysis equilibrium in FeCl3 solution: Fe3++3H2OFe(OH)3+3H+KspFe(OH)3=4*10-38, Kw=10*10-14 FeCl3 solution [Fe3+]=0.1 mol/L