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Why are soluble ionic compounds such as MgCl_2 considered electrolytes?
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6. Chemical Quantities & Aqueous Reactions
Electrolytes
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Which of the following best explains how ions conduct electricity in a solution?
A
Ions are trapped in a solid lattice and cannot move to conduct electricity.
B
Ions move freely in the solution, allowing them to carry electric charge between electrodes.
C
Ions neutralize each other, stopping the flow of electric current.
D
Ions form covalent bonds with water molecules, preventing the flow of electricity.
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Understand that electrical conductivity in a solution depends on the movement of charged particles, which are ions in this case.
Recall that in a solid ionic lattice, ions are fixed in place and cannot move freely, so they do not conduct electricity well in the solid state.
Recognize that when ionic compounds dissolve in water, they dissociate into free ions that can move independently throughout the solution.
Know that these free-moving ions carry electric charge between electrodes, enabling the solution to conduct electricity.
Conclude that the best explanation is that ions move freely in the solution, allowing them to carry electric charge and conduct electricity.
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