Why doesn't NaCl and HCl have the same effect on an equilibrium reaction
Recently in my AP Chem class we did a simple reaction demonstrating equilibrium: [Co(H2O)6]2+(aq)(pink) + 4Cl-(aq) <--> [CoCl4]2-(aq)(blue) + 6H2O(l) (in an ethanol solution). The reaction demonstrates how when you add HCl the solution becomes more blue and water makes it pink. However we had a bit of a problem. Our lab also told us to add NaCl, saying that it would have a similar effect to HCl but "not the same". But for as much NaCl that we added we couldn't seem to see any change. My teacher doesn't know what's going so I was hoping you would. P.S I don't think it's an error with the lab like contaminated salt or solution because this lab was conducted 7 separate times with seperate people, plus my teacher says she's been doing it for years and has never figured out why it doesn't work.