Error:
NaOH %2B I2 %2B Na3AsO3 %3D H2O %2B NaI %2B Na3AsO4
^
Unexpected character ('%')NaOH %2B I2 %2B Na3AsO3 %3D H2O %2B NaI %2B Na3AsO4
^
Unexpected character ('%')