Halogen Displacement & Redox Flashcards

All 5 cards in this deck

What is seen when chlorine water is added to colourless potassium bromide solution and shaken?

The mixture turns yellow/orange/brown, because bromine is displaced.

Write the half equation for the formation of bromine from bromide ions.

$2Br^- \rightarrow Br_2 + 2e^-$

Write the half equation for the reduction of chlorine molecules to chloride ions.

$Cl_2 + 2e^- \rightarrow 2Cl^-$

In a halogen displacement reaction, which species is oxidised and which is reduced?

The halide ions lose electrons, so are oxidised; the halogen molecules gain electrons, so are reduced.

What is seen when chlorine water is added to colourless sodium iodide solution, and why?

The solution turns brown, because chlorine displaces iodine from the iodide.