Question

Hydrogen Peroxide

Materials: Test tubes, test tube rack, 3% H2O2 , 0.1 M KI(aq)

1. Place 3 mL of 3% H2O2 (aq) in a test tube. Record its appearance.

2. Place 3 mL of 0.1 M KI in a second test tube. Pour the KI solution (catalyst) into the first test tube.

Record any evidence of a chemical reaction.

3. Balance the chemical equation. Note that KI is included in the equation above the reaction arrow because a catalyst only speeds up a reaction, it does not change the quantities of reactants.

4. Identify the type of chemical reaction.

Answer 1

Ans:

1. we placed 3ml of 3% H₂O₂ in test tube. we obsrved that the solution is colorless with slight bubbles. this solution denoted as A. then we have taken one more new test tube filled with white color 0.1M KI (3ml of water) resulting solution is appeared as colorless. therefore this solution denoted as B. its act as catalyst.

2. we have mixed both A and B solutions.we observed that the more amount of white color bubbles are appeared.

3. 2H₂O_{2 (aq)} + KI _(aq) ----------> 2H₂O _(l) +O_{2 (g)}

the H2O2 is undergo decomposition by KI catalyst to produce water and oxygen. therfore the bubbles appeared by oxygen only.

4. the name of given reaction is decopostion of hydrogen peroxide (H₂O₂)