nueawrs
K2Cr2O7 + 6FeSO4 + 7H2SO4 → Cr2(SO4)3 + 3Fe2(SO4)3 + K2SO4 + 7H2O.…
arian1925
phudung
Lienlinlin
PuddingcuaRindou
NivesCersus
Satoh-Izumi
mei_eim
cungtua
_best_Tulen
BiiKook