【摘要】 长期以来 ,化学教材中硬水软化部分 ,对煮沸Mg(HCO3 ) 2 溶液的产物有不同看法。笔者用Mg(OH) 2 与CO2 反应制得Mg(HCO3 ) 2 溶液 ,对煮沸Mg(HCO3 ) 2 溶液所得产物 ,用EDTA配位滴定和热重进行了分析 ,确定其组成为碱式碳酸镁 [3MgCO3 ·Mg(OH) 2 ·3H2 O],并建议在高中教材改革中将该部分进行适当修正更多还原

【Abstract】 For a long time,there have been different views on the product of boiling Mg(HCO 3) 2 solution for the part of softening hard water in chemistry text\|books.Mg(HCO 3) 2 solution was obtained by reaction of Mg(OH) 2 with CO 2 and analyzed the product of boiling Mg(HCO 3) 2 solution through EDTA coordination titration and thermogravimetry.Results indicated that the product is magnesium basic carbonate 3MgCO 3·Mg(OH) 2·3H 2O.So we suggest some emends should be made for this part in the chemistry text\|book for senior school.更多还原