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一二氧化碳在水中的溶解平衡根据气体的溶解定律:在一定条件下,降低温度,气体的溶解度增大;升高温度,气体的溶解度减小。二氧化碳在水中的溶解也符合这个规律。在常压下,升高温度它在水中的溶解度减小;反之,溶解度增大。其反应方程式是 CO_2(g)+H_2O(1)(?)CO_2(aq)+H_2O (1) CO_2(g)+H_2O(1)(?)H_2CO_3(aq) (2) H_2CO_3(aq)+H_2O(1)(?)H_3~+O+HCO_3~-(aq) (3) 溴甲酚绿的变色范围是pH=3.8～5.4。
A carbon dioxide dissolved in water in accordance with the law of dissolution: Under certain conditions, reduce the temperature, the gas solubility increases; increase the temperature, the gas solubility decreases. The dissolution of carbon dioxide in water also complies with this rule. At atmospheric pressure, its solubility in water decreases at elevated temperatures; conversely, solubility increases. The reaction equation is CO 2 (g) + H 2 O (1) (?) CO 2 (aq) + H 2 O (1) CO 2 (g) + H 2 O (1) (?) H 2 CO 3 (aq) (2) H 2 CO 3 (aq) + H 2 O (1) (?)H_3~+O+HCO_3~-(aq) (3) Bromocresol green has a color change range of pH=3.8 to 5.4.