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

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Introduction

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: 2 Co2+ (aq) ...read more.

Middle

Materials * Household Bleach * Co(NO3)2 solution * Erlenmeyer flask * Stopper and tube * Ring stand * Burette * Graduated cylinder * Thermometer * Burette clamp Procedure Refer to lab instruction sheet - "Decomposition of Bleach" Data Table 1 - Accumulation of Oxygen at Room Temperature (24�C) Time Interval (s) Volume of Gas (mL) Time Interval (s) Volume of Gas (mL) 30 3.5 210 29.9 60 9.1 240 34.3 90 13.4 270 38.3 120 18.0 300 42.0 150 20.8 330 44.5 180 25.9 360 50.1 Table 2 - Accumulation of Oxygen at 10�C above Room Temperature (34�C) ...read more.

Conclusion

13.2 1380 44.1 660 15.6 1440 45.6 720 18.1 1500 47.5 780 21.0 1560 49.6 840 23.0 1579 50.0 Analysis Calculations: Reaction Rate = Reaction rate at room temperature = = 0.14 mL O2 / s Reaction rate at 10�C above room temperature = = 0.17 mL O2 / s Reaction rate at 10�C below room temperature = = 0.036 mL O2 / s Table 4 - Rate of Decomposition of Bleach Surrounding Temperature (�C) Reaction Rate (mL/ s) 14 0.14 24 0.17 34 0.036 ?? ?? ?? ?? Selena Shao Partner: Shermeen Imtiaz Selena Shao Partner: Shermeen Imtiaz Selena Shao Partner: Shermeen Imtiaz Selena Shao Partner: Shermeen Imtiaz ...read more.

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