# Effect of side reactions on galvanic cell using iron rod as anode and sodium chloride as salt bridge

We just made a galvanic cell on a chemistry lesson using iron, iron sulfate , copper and copper sulfate.

We used a sponge soaked in $$\ce{NaCl}$$ solution as the salt bridge. The issue is that we measured a voltage way below the expected value and it was dropping quite fast.

The iron sulfate solution was yellow which may have indicated that the iron ions were reacting with chloride ions.

I just can't see why this reaction would cause it to stop working from a charge perspective. What is happening here?

• Iron sulfide solution doesn't exist it's insoluble in water may be you are seeing is iron chloride complex which is yellow – Avon97 May 13 at 18:21
• I'm sorry i meant iron sulfate not iron sulfide – Ankfintaren Duck May 13 at 21:59
• Iron(II) solutions as easily and quickly oxidized by oxygen from the air, producing a yellow solution of basic Fe(III) ions, according to : $$\ce{4 Fe^{2+} + O2 + 2H2O -> 4 [Fe(OH)]^{2+}}$$ – Maurice May 14 at 9:53