There are many other types of clock reactions. One that is sometime used for educational purposes...

There are many other types of clock reactions. One that is sometime used for educational purposes similar to this lab is the "Old Nassau Reaction". Provide a list of the chemical reagents used in the Old Nassau reaction and a list of chemical reagents used in the Vitamin C clock reaction. Which one of these reactions would you regard as greener and why?

Solutions

Expert Solution

The reactions involved in Old Nassau Reaction are as follows.

1. Na₂S₂O₅ + H₂O 2 NaHSO₃

2. IO₃^- + 3 HSO₃^- I^- + 3 SO₄^2- + 3 H⁺
This reaction reduces iodate ions to iodide ions.

3. Hg²⁺ + 2 I^- HgI₂
Orange mercury iodide solid is precipitated until the mercury is used up.

4. IO₃^- + 5 I^- + 6 H⁺ 3 I₂ + 3 H₂O

The excess I^- and IO₃^- undergo the iodide-iodate reaction

5. I₂ + starch a blue/black complex

A blue/black starch-iodine complex is formed.

The reactions involved in Vitamin C clock reaction are as follows.

1. 2I^- + H₂O₂ I₂ + H₂O

2. I₂ + Vitamin C I (colorless)

Here, Vitamin C clock reaction is regarded as greener.

Explanation: There are are no harmful by-products in Vitamin C clock reaction, whereas there are harmful sulfate by-products in Old Nassau Reaction.

queen_honey_blossom answered 2 years ago

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