1)PTHH: Al +3 AgNO3 \(\rightarrow\) Al(NO3)3 + 3Ag\(\downarrow\)
Fe + 2AgNO3 \(\rightarrow\) Fe(NO3)2 + 2Ag\(\downarrow\)
Al(NO3)3 + 3NaOH \(\rightarrow\) Al(OH)3\(\downarrow\) + 3NaNO3
Al(OH)3 + NaOH \(\rightarrow\) NaAlO2 + 2H2O
Fe(NO3)3 + 2NaOH \(\rightarrow\) Fe(OH)2\(\downarrow\) + 2NaNO3
4Fe(OH)2 + O2 \(\underrightarrow{t^o}\) 2Fe2O3 + 4H2O
2) có PT r chắc bn tính đc chứ ????