Chyba:
H%3A%2B %2B SO4%3A2- %2B I%3A- %3D H2S %2B I2 %2B H2O
^Neočakávaný ('%')H%3A%2B %2B SO4%3A2- %2B I%3A- %3D H2S %2B I2 %2B H2O
^Neočakávaný ('%')