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Questions and Answers
What does a salt bridge primarily allow to pass between the two half-cells?
What does a salt bridge primarily allow to pass between the two half-cells?
- Electrons only
- Ions only (correct)
- Metals only
- Gases only
What is a crucial function of the salt bridge in a voltaic cell?
What is a crucial function of the salt bridge in a voltaic cell?
- It completes the electrical circuit (correct)
- It generates electricity directly
- It prevents the complete dissipation of heat
- It maintains liquid levels in the half-cells
Which materials are commonly used to fill a salt bridge?
Which materials are commonly used to fill a salt bridge?
- Calcium carbonate (CaCO3)
- Potassium chloride (KCl) or potassium nitrate (NaNO3) (correct)
- Magnesium hydroxide (Mg(OH)2)
- Sodium sulfate (Na2SO4)
What prevents the draining or siphoning of liquid from one half-cell to another in a voltaic cell?
What prevents the draining or siphoning of liquid from one half-cell to another in a voltaic cell?
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What potential does the salt bridge help to prevent in a voltaic cell?
What potential does the salt bridge help to prevent in a voltaic cell?
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Study Notes
Salt Bridge
- A salt bridge is a tube filled with a saturated solution of potassium chloride (KCl) or potassium nitrate (KNO3) thickened with gelatin.
- The ends of the salt bridge are fitted with porous plugs or discs.
- Connects the two half-cells of an electrochemical cell.
- Allows the passage of ions between the two half-cells but prevents the draining or siphoning of liquid from one cell to the other.
- Necessary for the voltaic cell to function as it completes the circuit.
- Prevents liquid junction potential.
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