Chyba:
H3O%3A%2B %2B Cr2O7%3A2- %2B SO2 %3D Cr%3A3%2B %2B SO4%3A2- %2B H2O
^Neočakávaný ('%')H3O%3A%2B %2B Cr2O7%3A2- %2B SO2 %3D Cr%3A3%2B %2B SO4%3A2- %2B H2O
^Neočakávaný ('%')