题目

Do you want to live with a strong sense of peacefulness, happiness, goodness, and self- respect? The collection of happiness actions broadly categorized as honor help you create this life of good feelings．Here's an example to show how honorable actions create happiness． Say a store clerk fails to charge us for an item．If we keep silent, and profit from the clerk's mistake, we would drive home with a sense of sneaky excitement．Later we might tell our family or friends about our good fortune．On the other hand, if we tell the clerk about the uncharged item, the clerk would be grateful a19．已知A和B两支试管所盛的溶液中共含有K+、Ag+、Mg2+、Cl-、OH-、NO3-六种离子，向试管A的溶液中滴入酚酞试液呈红色．请回答下列问题：（1）试管A的溶液中所含上述离子共有3种．（2）若向某试管中滴入稀盐酸产生沉淀，则该试管为B（填“A”或“B”）．（3）若向试管A所含阳离子的硫酸氢盐溶液中加入Ba（OH）2溶液，使原溶液恰好成中性，写出该过程的离子方程式：Ba2++2OH-+2HCO3-=BaCO3↓+CO32-+2H2O．（4）若将试管A和试管B中的溶液按一定体积比混合过滤后，蒸干滤液可得到一种纯净物，则混合过程中发生反应的离子方程式为Ag++Cl-=AgCl↓，Mg2++2OH-=Mg（OH）2↓．（5）若试管A和试管B中的溶液是由等物质的量的四种物质配成的溶液，将两试管中溶液混合后过滤，所得滤液中各种离子的物质的量之比为n （K+）：n （Mg2+）：n （NO3-）=4：1：6．