\(Fe\left(HSO_4\right)_2\) ; Muối axit : Sắt(II) hidrosunfat
\(Ba\left(OH\right)_2\) : Bazo : Bari hidroxit
\(BaS\) : Muối trung hòa : Bari sunfua
\(Ba\left(HS\right)_2\) : Muối axit : Bari hidrosunfua
Fe(HSO4)2: sắt (II) hidrosunfat
Ba(OH)2:barihidroxit
BaS:barisunfua
Ba(HS)2:bari hidrosunfua