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Questions and Answers
What is the purpose of the salt bridge in the galvanic cell experiment?
To connect the half-cells and complete the circuit.
What does a negative voltage reading indicate in the experiment?
That the leads are connected to the wrong electrodes.
What is the purpose of creating multiple galvanic cells in the experiment?
To measure the voltage across each cell and arrange the metals in order of their reactivity.
How are the voltage readings taken in the experiment?
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What is the significance of a zero voltage reading in the experiment?
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Study Notes
• The lab experiment involves creating galvanic cells using different metals (aluminum, copper, iron, lead, magnesium, nickel, zinc) and their corresponding nitrate solutions. • The metals are used to create half-cells, which are then connected to form galvanic cells, and the voltage across each cell is measured using a multimeter. • The metal electrodes are placed in their respective solutions, and a salt bridge (containing agar gel and potassium nitrate) is used to connect the half-cells and complete the circuit. • The multimeter is set to measure DC volts, and the voltage readings are taken in millivolts, with three significant figures. • The voltage measurements are used to create an activity series, which is a list of the metals in order of their reactivity. • A negative voltage reading indicates that the leads are connected to the wrong electrodes, but this is acceptable as it allows the metals to be arranged in order of their activity. • The experiment involves creating multiple galvanic cells, each with a different combination of metals, and measuring the voltage across each cell. • The results of the experiment include: • Copper-Nickel: -328 millivolts • Copper-Aluminum: -493 millivolts • Copper-Zinc: 0.780 volts • Copper-Iron: -491 millivolts • Copper-Lead: -523 millivolts • Copper-Tin: -603 millivolts • Copper-Magnesium: -1.601 millivolts • Copper-Copper: 0 volts
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Description
This quiz is based on a lab experiment that involves creating galvanic cells using different metals and their corresponding nitrate solutions. The voltage across each cell is measured to create an activity series, which is a list of the metals in order of their reactivity. The experiment involves creating multiple galvanic cells and measuring the voltage across each cell.
