If the anode is made from copper the copper atoms will lose electrons to form copper ions which will then go into solution. C3.3 What are electrolytes and what happens during electrolysis? Passing an electric current through electrolytes causes the ions to move to the electrodes. Electrolysis of (i) copper sulfate solution with copper electrodes and (ii) acidified water with inert electrodes. When the experiment was over, we disconnected the electrodes carefully, washed them in distilled water and patted them gently dry. To find Mass of Cu mass = moles x Molar Mass = 0.001243523316 x 63.5 = 0.016 g of Cu deposited (2.s.f) 1. Once the copper metal anode dissolves, electrolysis, In this way the cathode is electroplated with copper metal, as, electrode. The copper electrodes are “active” meaning they take a part in the electrolysis. the determined mass was larger than the theoretical mass by a factor of 10 for the first trial at 0.2 amps, this was ruled out as an outlier while, all the other results after than remained at an almost constant rate of gain in mass of approximately 0.008 grams throughout changing the current from 0.4 amps to 1.2 amps. solution is increased, then the, Electrolysis of Copper in Copper Sulphate Solution. electrodes are detached and the cathode washed in distilled water, First, the electric current passed through the electrolytic cell will cause the copper sulphate solution to dissociate into it’s two component ions, Cu2+ and SO42-. Introduction If it is made from graphite oxygen will be formed and given off. I have chosen to investigate the affect that the size of current has on the electrolysis of the solution. All Rights Reserved. dissolved in water, but not when they are in a solid state as the We know that sometimes it's hard to find inspiration, so we provide you with hundreds of related samples. 3) Weigh the masses of the electrodes separately using a top pan balance.
to the cathode. Then both the copper electrodes are placed in a beaker This particular experiment involves the electrolysis of copper (II) sulphate using a pair of copper electrodes. Potential difference (voltage): directly proportional to the current therefore needs to be kept. As electricity flows through the molten ore, the compound splits apart and forms ions. Reaction at the cathode: From the equation it can be seen that 1 mole of Cu requires 2 moles of electrons to form. 188.8.131.52 Representation of reactions at electrodes as half equations (HT only). This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry section.