Purpose of Experiment:
To find the consequence of concentration of reactants on the current produced by a voltaic cell.
The greater the concentration of solution in the two half cells responding with the two metals to bring forth current. the greater the flow of current will be produced from the galvanic cell.
Concentration of both reactants ( Zn2+ and Cu2+ ) .
How the Independent Variable is changed:
Changed by thining the 1 mol L-1 ( Zn2+ and Cu2+ ) solution supplied with distilled H2O. while maintaining a changeless volume.
Current flow produced by the galvanic cell.
How the Dependent Variable is Measured:
Using a multimeter. set on 2V ( or lower depending on the current produced by the cell ) .
Other factors held Constant in the Experiment:
• Electrodes ( metal strips of Zn and Cu )
• Electrolytes ( both sulfate solutions )
• Volume of solutions used in the galvanic cell
• Length of saltbridge
• Saltbridge solution ( 0. 1 M KCl solution )
• Surface country of electrode dunking into the electrolyte solutions.
1. Use 2x 50 milliliter beakers to do up the undermentioned half cells. fill with 25 milliliters 1M Zn sulphate and 1M Cu sulphate solution in each beaker.
2. Use one 50 milliliter beaker. fill with 30 milliliters of 0. 1M K chloride.
3. Soak filter paper strip in the K chloride ( Keep the salt span same length for each perennial experiment ) .
4. Topographic point Zn metal into the 25 milliliter Zn sulphate and the Cu metal into 25 milliliter of Cu sulphate in the two 50 milliliter beakers.
5. Connect the two half cells utilizing the besotted filter paper strip ( salt span ) .
6. Complete the circuit utilizing wires and connected to the digital voltmeter and record electromotive force reading.
7. Discard used salt span and half cell contents. rinse and wash half cells ( 50 milliliter beakers ) to be used.
8. Repeat stairss 1-7 utilizing diluted Cu and zinc solution each clip thining solution to 2x. 4x. 6x and 8x dilution.
Table of Values 1. 0
|Concentration |Current Flow | | ( mol/L ) | ( Volts ) | |0. 125 |1. 09 | |0. 167 |1. 097 | |0. 25 |1. 11 | |0. 5 |1. 122 | |1 |1. 143 |
Not adequate solution for the experiments. miscalculated measure needed for the experiment. could afffect the preciseness and truth of the consequences.
Not mensurating volumes at oculus degree ( angle of paralllax ) will impact the truth of consequences due to the incorrect factor of dilution.
Voltmeter non decently calibrated ensuing in incorrect measuring of direct current electromotive force reading.
Fixed solution concentration non the same suggested concentration impacting overall information record.
The importance of reiterating the experiment for the figure of samples in the experiment is to cut down the sum of mistake in the experiment and to do the the experimental measurement more accurate and precise.
Due to exposure of random and systematic mistakes the truth of the consequences may change from the existent measurings of concentration and current. significance that the recorded information was non accurate. The preciseness of the consequences did vary. there were points below the line of best tantrum proposing random mistake. The experiment was non really precise. repetitions of the experiment could better this job.
A big measure of undiluted solution could hold improved the overall experiments by repetitions of the same experiment. as one of the trial samples could hold been compared with other samples of the same trial to better the truth and preciseness of consequences.
Keeping the salt span at the same length for each experiment could hold improved the consequences from each proving. as wet equipment could hold had an consequence on the concentration degree of the different experiments making mistakes within the experiment.
The experiment showed that an increased concentration did increase the sum of current fluxing through the circuit. This verifies that the hypothesis was valid for the experiment. Although taking into acocunt that there is non grounds to propose an accurate relationship between the concentration and flow of current.