In this experiment, the rate of decomposition is calculated by measuring the volume of the product gas using water displacement.

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Decomposition of Bleach

Introduction

In this experiment, the rate of decomposition is calculated by measuring the volume of the product gas using water displacement. The reactant used is household bleach, which contains 5 to 6% of NaClO. The decomposition can be stated in this following equation:

2 ClO- (aq)    2 Cl- (aq)   + O2 (g)

To measure the rate of decomposition, a catalyst is needed to fasten the reaction. A suitable catalyst is Co2O3, which is produced from mixing Co(NO3)2 and bleach. The reaction can be described as follows:

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2 Co2+ (aq)  +  ClO- (aq)  +  2H2O (l)    Co2O3 (s)  +  4 H+(aq)  +  Cl-(aq)

Purpose

The objective of this experiment is to determine the rate of decomposition of bleach by measurement of gas production at several different temperatures.

Hypothesis

The decomposition rate will increase if the surrounding temperature increases. If the surrounding temperature increases by 10°C, the reaction rate will double. If the temperature decreases by 10°C, then the reaction rate will decrease by half.

Materials

  • Household Bleach
  • Co(NO3)2 solution
  • Erlenmeyer flask
  • Stopper and tube
  • Ring stand
  • Burette
  • Graduated cylinder
  • Thermometer
  • Burette clamp

Procedure

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