# Rate of Reaction Design Lab Assignment Words: 818

This reaction can be sped up with various methods such as modifying the temperature, modifying the concentration, or introducing a catalyst. We will be specifically looking at the effect of concentration of the H2O solution rather than the effect of the temperature. We will also introduce a catalyst, Manganese(lb) Oxide (Mann), In order to speed up the reaction so that It can occur, however It will be controlled so that we only look at the effect of concentration of H2O. This will be done by measuring the volume of 02 produced.

Research Question In the decomposition of Hydrogen Peroxide, how will changing the concentration of a H2O solution affect the volume of 02 produced in its gaseous state, thereby affecting the rate of reaction? Hypothesis If we increase the concentration of a reactant the number of particles that are available to react per unit area will also Increase. In saying this, if we increase the concentration of H2O solution, it will be able to react with Mann more frequently therefore decomposing the reaction further. This should create a higher rate of action.

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Since the volume of oxygen produced equals the amount of mass lost by the system, we can see by the equation: “rate of reaction = volume of substance produced (in a specified time) / time that if the mass lost by the system increases, the rate of reaction should also increase. I predict that when we increase the concentration of H2O solution the mass of the system will decrease, thereby producing a higher rate of reaction Variables Dependent Variable The dependent variable will be the total volume of oxygen produced.

This can be assured by recording the mass of the beaker, H2O and Mann during the reaction at specific time Intervals. Then, If we subtract each Interval from the Initial total mass of the beaker, H2O solution, and Mann we will get the volume of 02 created at each Independent Variable The independent variable will be the concentration of H2O. It will be altered from 1%, 2%, 3%ћ 4% and 5% Hydrogen Peroxide in order to have a reaction occur and accurately determine the volume of 02 produced.

These percentages of Hydrogen Peroxide can be purchased from a pharmacy, but for further assurance one could SE a method of titration whereby you add specific amounts of Hydrogen Peroxide into another substance, for example sodium theosophical, to find a proportion in which one could use to calculate the concentration. Controlled Variables How they will be Controlled? Temperature at which the reaction will occur within The reaction will occur at a constant room temperature, specifically 21 co.

To control this we must wait a few minutes before beginning each trial in order for the Hydrogen Peroxide solution to reach room temperature. Volume of the Hydrogen Peroxide Solution Since Hydrogen Peroxide is very dangerous at high volumes, and we also need to have the reaction last long enough to record results, we will measure the volume at a constant ml to use per trial Mass of Manganese(lb) Dioxide Since the decomposition of Hydrogen Peroxide is also very slow the addition of a catalyst is needed in order for the reaction to occur.

This catalyst will be set to use at log per trial. Type and Size of Containers Since the decomposition of hydrogen peroxide is exothermic, and will release a lot of eat. We must use glass rather than plastic because plastic will shrink when heated and that may have an unneeded effect on our total mass. Also the glass beakers will be have be large enough to contain ml + log of hydrogen peroxide. We will be using ml beakers. Also they will have ml markings in order to accurately measure the volume of Hydrogen Peroxide.

Scale The scale used to measure the mass must be to the nearest tenth in order to accurately represent the masses. We will be using a digital scale that measures to the nearest tenth. Time Intervals cord the masses will be set to as, ass, ass, and ass. Apparatus – Four ml beakers with ml markings. (Three for reactions, One for Manganese Oxide), each labeled 1, 2, 3, 4 respectively – One digital scale measuring to the nearest tenth of a gram. 150 grams of Manganese(lb) Oxide – 150 ml of 1% Hydrogen Peroxide – 150 ml of 2% Hydrogen Peroxide – 150 ml of 3% Hydrogen Peroxide – 150 ml of 4% Hydrogen Peroxide – 150 ml of 5% Hydrogen Peroxide – Stopwatch – Distilled Water – Safety Goggles – Gloves Procedure 1 . For safety precautions, put on safety goggles and gloves, tie any long hair back, move any accessories on hand or arm. 2. Using the digital scale, record the initial weight of a beaker alone 3. Using the digital scale, add log of Manganese(lb) oxide to beaker 4 4. Pour ml of 1% Hydrogen Peroxide into beaker 1 5.

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