A:向沸水中滴加FeCl3溶液制备Fe(OH)3胶体:Fe3++3H2OFe(OH)3↓+3H+
B:向小苏打溶液中加入过量的石灰水:Ca2++OH-+HCO3-=CaCO3↓+H2O
C:向硫酸氢钠溶液中加入氢氧化钡使溶液呈中性:Ba2++OH-+H++SO42-= BaSO4↓+H2O
D:用食醋除去水壶中的水垢:CaCO3+2H+=Ca2++CO2↑+H2O
科学探究一般包括五个基本过程,即提出问题、____、____、____、得出结论。
You are discussing the following picture with your English friend Jim. Now you are telling him how you understand the picture and what makes you think so.