题目

Barbie （巴比娃娃）, believe it or not, is 50 this year and she’s still as popular as ever. A doll is a doll , but Barbie illustrates how, over the last five decades, women have become a standard for judging what freedom really means How women are treated in different countries tells you a lot about the politics and culture of where they live. The doll that every little girl wants enables young children to test their possibilities in role playing, giving them a glimpse of what they might be when they grow up, whether to be frivolous or serious （or both）. But in many countries that现有一包固体粉末，可能含有FeCl3、Na2SO4、NaOH、CaCO3、NH4HCO3、Na2CO3中的一种或几种。现做如下实验：（1）取少量固体加热，无氨味。则原固体中一定不含_____。（2）另取少量固体溶于水，得到无色澄清溶液。则原固体中一定不含_____。（3）取（2）中溶液适量，滴加过量BaCl2溶液，过滤得白色固体A和滤液B。固体A能全部溶于稀硝酸并产生气泡。则原固体中一定含有_____，一定不含_______。（4）向滤液B中通入CO2，产生白色沉淀，由此判断原固体中还含有NaOH。生成白色沉淀总反应的化学方程式_____。