Cân bằng các PTHH sau đây.
(1) $CuO\; +\; 2\;HCl \;\rightarrow\;CuCl_2\; +\;2\;H_2O$
$\text{Oxit bazo}....\text{Axit}.......\text{Muối}....\text{Nước}............................................$
(2) $CO_2\; +\; 2\;NaOH \;\rightarrow\; Na_2CO_3\; +\;H_2O$
$\text{Oxit axit}.....\text{Bazo}........\text{Muối}......\text{Nước}........................................$
(3) $K_2O\; +\;H_2O \;\rightarrow\;2\;KOH$
$\text{Oxit bazo}...\text{Nước}.....\text{Bazo}.......................................................$
(4) $Cu(OH)_2\;\overset{t^0}{\rightarrow}\;CuO\; +\;H_2O$
$....\text{Bazo}.....\text{Oxit bazo}...\text{Nước}...................................................$
(5) $SO_2\; +\;H_2O \;\rightarrow\; H_2SO_3$
$\text{Oxit axit}..\text{Nước}......\text{Axit}........................................................$
(6) $Mg(OH)_2\; +\;H_2SO_4 \;\rightarrow\;MgSO_4\; +\; 2\;H_2O$
$...\text{Oxit bazo}......\text{Axit}.......\text{Muối}......\text{Nước}....................................$
(7) $CuSO_4\; +\; 2\;NaOH \;\rightarrow\;Cu(OH)_2\; +\; Na_2SO_4$
$....\text{Muối}.......\text{Bazo}......\text{Bazo mới}.....\text{Muối mới}.................................$
(8) $AgNO_3\; +\;HCl \;\rightarrow\; AgCl\; +\; HNO_3$
$....\text{Muối}.....\text{Axit}...\text{Muối mới}..\text{Axit mới}.........................................$
(9) $H_2SO_4\; +\; ZnO\;\rightarrow\; ZnSO_4\; +\; H_2O$
$...\text{Axit}...\text{Oxit bazo}.....\text{Muối}.....\text{Nước}...........................................$