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The theory of conductance in solution describes the ability of a solution to conduct electricity. The conductance of a solution is determined by the concentration of ions in the solution and the mobility of these ions. Ions are atoms or molecules that have gained or lost electrons, resulting in a net electrical charge. Electrolytes are substances that, when dissolved in a solvent, produce ions. The more ions that are present in a solution, the greater the conductance of the solution. The mobility of ions is also a factor in determining the conductance of a solution. Ions with a higher mobility can move more easily through the solution, which increases the conductance. The conductance of a solution can be measured using a conductivity meter. Conductivity meters measure the resistance of a solution to the flow of electricity. The lower the resistance, the higher the conductance of the solution.