2. A colorless solution of KBr is added to a colorless solution containing Cl2.
ID: 556267 • Letter: 2
Question
2. A colorless solution of KBr is added to a colorless solution containing Cl2. Assume aqueous solutions and assume the reaction occurs. (Youll receive some data later that allows you to check this assumption.) a. Write the balanced net ionic equation (leave out spectator ions) for this reaction: b. In your equation in (a), circle the chemical formula of the oxidizing agent. c. Draw a pictur e or representation of this reaction that helps you to visualize how electrons are being transferred. (Hint: Lewis dot structures and arrows showing transfer of electrons might be useful.)Explanation / Answer
2KBr(aq) + Cl2(g) -----------> 2KCl + Br2
2K^+ (aq) +2Br^-(aq) + Cl2(g) -----------> 2K^+ (aq) +2Cl^- + Br2
removal of spectator ions to get net ionic equation
2Br^-(aq) + Cl2(g) -----------> 2Cl^- + Br2(l) net ionic equation
in this reaction Bromine oxidation number -1 to 0 increases. Br^- is reducing agent
Chlorine oxidation number decreases from 0 to -1 . So Cl2 is oxidising agent.
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