96 Chem CE改編 Redox Reaction..30分

potassium, sodium and calcium is the first three active metal
in the metal activity series. it means they are very active.
potassium and sodium will react vigorously with water and form
hydrogen. since iron iii nitrate solution is acidic , the reaction
with them will be explosive. so we cannot put the three metals
in the iron iii nitrate.