Chemistry Galvanic Cell
Stage 2 Chemistry
Investigation Folio: Practical – Galvanic Cell
Name: YY
Names of Partner: ZZ
Part A
Investigation Design Proposal:
Purpose of Experiment:
To determine the effect of concentration of reactants on the current produced by a galvanic cell.
Hypothesis:
The greater the concentration of solution in the two half cells reacting with the two metals to produce current, the greater the flow of current will be produced from the galvanic cell.
Independent Variable:
Concentration of both reactants (Zn2+ and Cu2+).
How the Independent Variable is changed:
Changed by diluting the 1 mol L-1 (Zn2+ and Cu2+) solution supplied with distilled water, while keeping a constant volume.
Dependent Variable:
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 area of electrode dipping into the electrolyte solutions.
Procedure:
1. Use 2x 50 mL beakers to make up the following half cells, fill with 25 mL 1M zinc sulfate and 1M copper sulfate solution in each beaker.
2. Use one 50 mL beaker, fill with 30 mL of 0.1M potassium chloride.
3. Soak filter paper strip in the potassium chloride (Keep the salt bridge same length for each repeated experiment).
4. Place zinc metal into the 25 mL zinc sulfate and the copper metal into 25 mL of copper sulfate in the two 50 mL beakers.
5. Connect the two half cells using the soaked filter paper strip (salt bridge).
6. Complete the circuit using wires and connected to the digital voltmeter and record voltage reading.
7. Discard used salt bridge and half cell contents, rinse and wash half cells (50 mL beakers) to be used.
Investigation Folio: Practical – Galvanic Cell
Name: YY
Names of Partner: ZZ
Part A
Investigation Design Proposal:
Purpose of Experiment:
To determine the effect of concentration of reactants on the current produced by a galvanic cell.
Hypothesis:
The greater the concentration of solution in the two half cells reacting with the two metals to produce current, the greater the flow of current will be produced from the galvanic cell.
Independent Variable:
Concentration of both reactants (Zn2+ and Cu2+).
How the Independent Variable is changed:
Changed by diluting the 1 mol L-1 (Zn2+ and Cu2+) solution supplied with distilled water, while keeping a constant volume.
Dependent Variable:
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 area of electrode dipping into the electrolyte solutions.
Procedure:
1. Use 2x 50 mL beakers to make up the following half cells, fill with 25 mL 1M zinc sulfate and 1M copper sulfate solution in each beaker.
2. Use one 50 mL beaker, fill with 30 mL of 0.1M potassium chloride.
3. Soak filter paper strip in the potassium chloride (Keep the salt bridge same length for each repeated experiment).
4. Place zinc metal into the 25 mL zinc sulfate and the copper metal into 25 mL of copper sulfate in the two 50 mL beakers.
5. Connect the two half cells using the soaked filter paper strip (salt bridge).
6. Complete the circuit using wires and connected to the digital voltmeter and record voltage reading.
7. Discard used salt bridge and half cell contents, rinse and wash half cells (50 mL beakers) to be used.