Investigating The Rate Of Electrolysis. An Investigation To Find Out What Factors Affect The Rate Of Electrolysis Of A Solution Containing Copper (Ii) Ions.

2805 words - 11 pages

Investigating the rate of electrolysis.An investigation to find out what factors affect the rate of electrolysis of a solution containing copper (II) ions.PlanIt is known that by passing a constant electric current through a copper sulphate solution the passage of ions through this solution results in copper atoms being dissolved into the solution from the anode, which has a positive charge while positive copper, ions (cations) are also being discharged at the cathode which has a negative charge. Normally anions, which have a negative charge, are discharged at the anode.The experiment I will be carrying out is aimed to observe the amount of Copper (Cu) metal deposited during the electrolysis of Copper Sulphate solution (CuSo4) using Copper electrodes, when certain variables are changedIn this investigation I will change variables within the experiment, which will hopefully change the rate of reaction and also the deposit of copper metal at the cathode.These variables could include:· Voltage· Concentration of solution/ Quantity of Solution· Surface area/ Size of Electrodes· Temperature· Molarity/Concentration of Solution· Distance between the electrodesThese variables all have a way of changing the rate of reaction.Voltage:Changing the voltage of the circuit would affect the rate of reaction because as Ohm's law states, As charged particles try to make their way round a circuit they encounter resistance to their flow which means that they collide with atoms in the conductor. More resistance means that more energy is needed to push the same number of electrons through part of the circuit. So by increasing the voltage more electrons will flow through the circuit, which means there would be a lot more electrons flowing in the circuit therefore there will be a lot more energy being produced. This means that the more voltage flowing through the circuit the faster the reaction will take place.Concentration of a solution:For many reactions involving liquids or gases, increasing the concentration of the reactants increases the rate of reaction. In a few cases, increasing the concentration of one of the reactants may have little effect of the rate so changing the concentration could speed up the reaction or it could have no affect at all. Although, it is very common that when you increase the concentration the reaction does speed up.If we were to say in this reaction increasing the concentration would speed up the reaction I shouldn't assume that if I double the concentration of one of the reactants that I will double the rate of the reaction. It may happen like that, but the relationship may be more complicated. In order for any reaction to happen the particles must first collide. This is true whether both particles are in solution, or whether one is in solution and the other a solid. If the concentration is higher, the chances of collision are greater as there are more of the particles that react in the solution...

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