化學--入考場之前一定要識背既ppt表

相信温得熟既同學都知道下面個表係乜，大家係考試之前記得背熟個表，先分到邊隻ionic compound 係soluble，邊隻係insoluble。粗略估計，每年起碼有10-20分直接/間接考核下面個表，所以大家千其唔好睇少佢！！

Anion	✓		✘
NO3-	All
HCO32-
OH-	Ba2+	Group I     NH4+
O2-
CO32-
SO42-			Pb2+,  Ca2+,  Ba2+
VII			Ag+,  Pb2+

小練習

判斷以下哪個物質是可溶於水

Which of the following substances are soluble in water?

1.        CaCl₂                                                PbSO₄

2.        MgCO₃                                             K₂O

3.        (NH₄)₂CO₃                                                BaO                                            

4.        ZnO                                                 Fe(NO₃)₃

5.        KHCO₃                                                      CuSO₄

答案 answer

1.        CaCl₂           ✓                              PbSO₄

2.        MgCO₃                                           K₂O              ✓

3.        (NH₄)₂CO₃     ✓           BaO                                 

4.        ZnO                                               Fe(NO₃)₃           ✓

5.        KHCO₃            ✓                                   CuSO₄               ✓