Electrolysis of Copper in Copper Sulphate Solution
Introduction
Aim
This is an investigation into how temperature affects the amount of
copper lost from the Anode and gained on the Cathode during
electrolysis.
Electrolysis is…
The chemical change by passing electric charge through certain
conducting liquids (electrolytes). The current is conducted by
migration of ions - negative ones from the Anode (positive electrode),
and positive ones to the Cathode (negative electrode). Reactions take
place at the electrodes by transfer of electrons in the direction of
the current.
In this case, copper electrodes in a copper sulphate solution are
used.
In the electrolysis of copper, copper atoms in the Anode become copper
ions by losing electrons which go into the circuit.
Cu - 2e à Cu
The positive ions are attracted to the negative Cathode but only
copper ions are discharged.
Cu - 2e à Cu
So this electrode gets coated with copper.
Diagram
[IMAGE]
Also attached to this circuit will be a variable resistor. An ammeter,
placed in the circuit, will register the flow of current: from this
indication, the electric circuit can be deduced to be complete.Also, a
stopwatch will be used.
The 'cell' is a power pack.
Variables
The variables in this experiment are:
· The electrodes
· Resistance
· The electrolyte
· Temperature
· Position of the electrodes (Distance between)
· Time
Only the size of the electrodes and times are being investigated,
therefore in order for this to be a fair test, the other factors must
be kept constant.
The same CuSO will be used throughout, so the concentration is the
same, and the same spacing between electrodes will be used. The size
of the electrodes should be the same, but they will be reused, so the
size will change from one experiment to another.
Time intervals of 5 minutes for each experiment will be used, until it
Purpose: The purpose of the lab was to perform a series of chemical reactions in order to transform copper within different reactions in order to start and end with solid brown copper.
ED is an electrical system utilizing ion exchange membranes. Ion exchange membranes have permselectivity similar to RO and NF membranes [6]. It is very important to understand the mechanism of permselectivity of ion exchange membranes to design ED system. The transport number ratio between target ion and standard ion has been treated to discuss the permselectivity of ion exchange membrane in ED system [7]. Recently, it was found that the ratio of transport number of several anions to chloride ion changed with the progress of electrodialysis. In this paper, a mechanism of permselectivity of ions in the electrodialysis system is theoretically discussed to make clear the reason why the transport number ratio changes with the progress of deionization in electodialysis process. In addition, the simple way to simulate ED system is proposed.
The purpose of this lab was to to cycle solid copper through a series of chemical forms and return it to its original form. A specific quantity of copper undergo many types of reactions and went through its whole cycle, then returned to its solid copper to be weighted. We observed 5 chemical reactions involving copper which are: Redox reaction (which includes all chemical reactions in which atoms have their oxidation state changed), double displacement reaction, precipitation reaction, decomposition reaction, and single displacement reaction.
In this experiment the researcher will create a simple conductance sensor by using a battery to run a charge through the liquid. The researcher also intends to use an electrical multi-meter to find the current and then subsequently find the conductivity through the use of a formula. The researcher will determine the conductivity of the Gatorade before and after freezing to determine of being frozen had an effect on the Gatorade’s
An electrode is a component of an electric circuit that connects the conventional wiring of the circuit to a conducting medium such as an electrolyte or a gas. The electrically positive electrode is called the anode and the negative electrode the cathode. If an anode and a cathode are placed in a solution of an electrolyte and a source of direct current is connected between them, the positive ions in the
Planning Firstly here is a list of equipment I used. Boiling tubes Weighing scales Knife Paper towels 100% solution 0% solution (distilled water) measuring beakers potato chips Cork borer. We planned to start our experiment by doing some preliminary work. We planned to set up our experiment in the following way.
Metals contain a sea of electrons (which are negatively charged) and which flow throughout the metal. This is what allows electric current to flow so well in all metals. An electrode is a component of an electric circuit that connects the wiring of the circuit to a gas or electrolyte. A compound that conducts in a solution is called an electrolyte. The electrically positive electrode is called the anode and the negative electrode the cathode.
An atom, by definition, is the smallest part of any substance. The atom has three main components that make it up: protons, neutrons, and electrons. The protons and neutrons are within the nucleus in the center of the atom. The electrons revolve around the nucleus in many orbitals. These orbitals consist of many different shapes, including circular, spiral, and many others. Protons are positively charged and electrons are negatively charged. Protons and electrons both have charge of equal magnitude (i.e. 1.602x10-19 coulombs). Neutrons have a neutral charge, and they, along with protons, are the majority of mass in an atom. Electron mass, though, is negligible. When an atom has a neutral charge, it is stable.
In my experiment, voltage, material and temperature will remain constant. Prediction = == == ==
== == I completed a table to show my results, here is the table: Table 1. Results of different changes of substances Part A Copper (II) Sulfate and Water Reactant description Water (reactant): Color: Colorless Transparency:
To investigate the temperature change in a displacement reaction between Copper Sulphate Solution and Zinc Powder
In the experiment there are several possible ways of changing the electric current such as changing the voltage or the position of the electrodes within the electrolysis cell. However, it was found from preliminary work that the most effective way to change the current was to change the concentration of the acid solution. The preliminary work showed that the greater the concentration of the acid, the greater the current. Ohm's law states that R(resistance) =
The cell anode is usually a piece of the metal to be plated from solution; this enables the anode reaction of metal dissolution to replace the metal ion lost from solution by the cathodic decomposition. Factors There are many various factors that affect the mass deposited during electroplating:- 1). Current (A) - An increase in the amount of current increases the amount of substance deposited in a fixed amount of time, because there is more energy available to move ions/electrons to the cathode from the anode. A smaller current will pump fewer copper ions from the anode to the cathode in the same amount of mass gained on the cathode is lower. 2).
of Copper Sulphate. To do this I plan to work out the amount of water
Investigating the Effect of Copper Sulphate on Amylase Activity Aim The aim of my experiment is to observe the affect on amylase when adding copper sulphate to a starch solution. Introduction Enzymes are that act as catalysts, in other words they increase the rate of chemical reactions. Consider the following general reaction between two substances, A and B, which react together to form a product, substance C: A + B = C In biological systems, this reaction might occur very slowly, or not at all, in the absence of an enzyme. Enzymes will greatly increase the rate of formation of the product. They can increase the rate of reactions by a factor of at least one million.