Question

Metals bond with halogens to form colorless metal halides. During an experiment, bromine water was added to a solution of potassium iodide. A record of the experiment is shown.
Experimental Record
Reactants Color of Reactants Color of Reactants after Mixing
Br2 Light orange solution Deep brown colored solution is formed
KI Colorless solution


Which of the following conclusions can be made about this chemical reaction based on the data?

Answer 1

Answer:

Bromine displaced iodide to form iodine

Explanation:

In this experiment, liquid bromine was allowed to react with a solution of potassium iodide.

Initially, we had a colorless $KI$ solution which was mixed with light orange $Br_2$. If we add a light orange solution to a colorless solution, liquid bromine will get diluted and we'll see a slight decrease in its color intensity, however, if no reaction takes place, no color change will occur.

In the experiment, however, we examine a formation of a deep brown solution. Remember that iodine solution would form a brown solution.

As a result, bromine displaced iodide anion from potassium iodide:

$2~KI~(aq) + Br_2~ (l)\rightarrow 2~KBr~(aq) + I_2~(aq)$