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用Fe~(2+)溶液的不同pH条件下与二氮杂菲络合显色的实验,揭示了Fe~(2+)与二氮杂菲络合的关系。 1.pH值对Fe~(2+)溶度积的影响的实验,Fe~(2+)完全溶于稀酸中,取此酸性条件的Fe~(2+)1mg/10mL,逐滴加入6N氨水,当pH2.5时即出现微小浊度,说明Fe~(2+)的络合反应在pH2.5以下进行为佳。 2.络合与显色的不同pH条件:Fe~(2+)在1M盐酸的酸性条件即能与二氮杂菲络合,但开
The experiment of complexing with phenanthroline with different pH of Fe 2+ solution revealed the complexation of Fe 2+ with phenanthroline. Effect of pH value on the solubility product of Fe ~ (2+): Fe 2+ was completely dissolved in dilute acid and 1 mg / 10 mL of Fe 2+ was added under acidic conditions. The solution was added dropwise 6N aqueous ammonia, when pH2.5 tiny turbidity appears, indicating Fe ~ (2+) complexation reaction is better than pH2.5. 2. Different pH conditions of complexation and color development: Fe ~ (2+) complexed with phenanthroline in the acidic condition of 1M hydrochloric acid,