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The expectation and prediction for this experimentation is based upon prior knowledge that has been presented during our science class units, specifically the unit ‘Responsible Combustion and Production’, looking deeply into the five different chemical reactions. The hypothesis for this reaction is that the hydrogen peroxide will react with the potassium iodide (catalyst) and release a small discharge of gas in the form of bubbles created by the dish washing detergent.
This experimentation is based upon one specific type of chemical reaction, the decompo-sition reaction.
The decomposition reaction can also be known as a chemical breakdown, or an analysis reaction. Decomposition reactions are when one reactant yields two or more products. The most common form of an decomposition reaction is AB = A+B, AB represents a compound ( The solution of two elements merging together ), and A + B sig-nifies either 2 elements merging or two compounds merging , resulting in the decomposi-tion reaction form looking similar to this C = E/C + E/C.
In order to identify this reaction, single reactions with numerous products must be seen or, the opposing reaction, a synthesis reaction (A+B=AB) must be nonexistent.
The goal of this experimentation is to look at different types of reactions and there effects on the world around us, such as the synthesis reaction experimentation between steel wool and a bunsen burner (heat), showing its connection between the sustainable devel-opment goals (SDG) life on land and life below water.
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This reaction depicts a steel wool scrubber being placed over a flam and slowly melting/decaying, falling into smaller piec-es which can be further placed into real life circumstances such as bridges/buildings rust-ing causing dangerous incidents to occur such as building collapsing or bridges disposing of its rustic in to water sources polluting them.
The purpose of this experimentation is to witness a decomposition reaction, by combin-ing hydrogen peroxide, catalyst, food coloring and dish washing detergent it ensure that the evidence of a decomposition reaction has occurred and been observed.
Compare and contrasting the differences and similarities of this reaction, help to determine the correct reaction of many different solution, and help to determine the correct chemical formulas of reactions without referring back to textbook practices.
The materials used in this experimentation can be commonly found in many house holds draws or medicine boxes. Food coloring and dishwashing liquid are more of the more commonly used around a house hold environment, used for cooking and cleaning up dirty surfaces, while hydrogen peroxide is mainly found in medicine cabinets or first aid kits. Hydrogen peroxide acts as a cleaning agent for small cuts and scrapes, however it can also be used almost like bleach if place in hair for long periods of time. Potassium iodide is an medication, and dietary supplement used to treat hyperthyroidism and to protect the thyroid gland during radiation emergencies.
First Experimentation Second Experimentation
40ML Hydrogen peroxide ( Low Concentration ) 60ML Hydrogen peroxide ( High Concentration )
3 Drops of Food Colouring 1 Drops of Food Colouring
A Squirt of DishwashingDe-tergent A Squirt of DishwashingDe-tergent
Meaning Cylinder Meaning Cylinder
A Larger Plastic Tub (meas-urements) A Larger Plastic Tub
(measurements)
A Table Spoon Catalyst ( Po-tassium Iodide ) Two Table Spoons of Cata-lyst ( Potassium Iodide )
Gloves Gloves
Protective Lab Coat Protective Lab Coat
Protective Goggles Protective Goggles
Procedure 1
Procedure 2
Word formula Potassium io-dide + hydro-gen peroxide → potassium hydroxide Potassium io-dide + hydro-gen peroxide → potassium hydroxide
Chemical Equation 2KlOH → 2Kl + H2O2 2KlOH → 2Kl + H2O2
Observations Once the catalysis was com-bined with the hydrogen perox-ide it produced a small reaction of foam. The reaction was quite slow and did not produce much of the foam solution, only enough to just tip over the rim of the test tube cylinder. When a higher concentrated hy-drogen peroxide was placed into the test tube cylinder with the catalyst it created a large burst of foam, spilling over the side of the tray. The foam was warm and released small amounts of steam and in certain areas closer to the cylinder.
As discussed earlier the hypothesis for this reaction is that the hydrogen peroxide will react with the potassium iodide (catalyst) and release a small discharge of gas in the form of bubbles created by the dish washing detergent. The reasoning behind this hy-pothesis is that when hydrogen peroxide secluded it decomposes slowly over time, to form oxygen gas and hydrogen. This decomposition is so slow that the evidence of the reaction it is barely visible for the human eye to observe. In spite of this if potassium iodide was to be added into the compound it would act as a speeding agent, excelling the decomposition process of hydrogen peroxide. The food coloring and dishwashing detergent are also added into the solution to ensure that the reaction between hydro-gen peroxide and potassium iodide (catalyst) can be observed.
The compounds used in this experimentation were H2O2 , hydrogen peroxide and Kl, potassium iodide. When combined these compounds create a warm foamy solution otherwise known as ‘Elephants toothpaste’ due to its size and texture. The chemical formula for this equation is 2KlOH → 2Kl + H2O2 .
For the first experimentation we filled the cylinder with 40ML of hydrogen peroxide, this specific hydrogen peroxide was low in concentration and as a result when the catalyst was added the reaction was very weak, only parts of the hydrogen peroxide reacting with the catalyst, leaving leftover hydrogen peroxide at the Bottom of the cylinder. In order to improve the reaction between both compounds a new bottle of hydrogen per-oxide was used in the seconded experimentation (plus an extra 20ML) ,this bottle con-taining a higher concentration. An extra table spoon of potassium iodide and an extra 20ML of hydrogen peroxide was also added to ensure that the reaction would take place even if the percentage of concentration from the hydrogen peroxide was low. When the second experimentation took place the reaction between both compound was much larger, spilling over the side of the plastic tray, and producing heat in small spurs of steam (gas).
Throughout the first experimentation a large amount of food colouring and dish wash-ing detergent was added creating a protective base onto of the hydrogen peroxide, this prevented the potassium iodide form reacting fully with the hydrogen peroxide, hence during the second experimentation only 1 drop of food coloring was added instead of 3, and half a squirt of dish washing detergent was added instead of a hole squirt, re-ducing the probability of the potassium iodide incapability to reach the hydrogen perox-ide to complete the reaction.
The sustainable development goal (SDG) that ties back to the decomposition reaction is life on land and responsible consumption and production. There are many decompo-sition reactions that happen daily on land, one of the main decomposition reactions that take place is produced by cans, more specifically soft drinks. Soft drinks or Car-bonic acid H2CO3 create a decomposition reaction when a person opens a can of soft drink, and the carbon dioxide begins to bubble and fuzz out. When the can opens the carbonic acid breaks down and produced to separate elements H2O and CO2 , the chemical formula for this decomposition reaction is H2CO3 → H2O + CO2.
Thousands of cans are made each year on land than thrown away to create mountains of trash that in most cases does not get recycled, with the rate of production and con-sumption the mountains of trash only get bigger.
Investigating Decomposition Reactions: Hydrogen Peroxide and Potassium Iodide Catalyst. (2024, Feb 22). Retrieved from https://studymoose.com/document/investigating-decomposition-reactions-hydrogen-peroxide-and-potassium-iodide-catalyst
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