Fehler:
Fe2%28SO4%293 %2B NaOH %3D Fe%28OH%293 %2B Na2SO4
^
Unerwartets Zeichen ('%')Fe2%28SO4%293 %2B NaOH %3D Fe%28OH%293 %2B Na2SO4
^
Unerwartets Zeichen ('%')