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Even Though Pure Bottled Water Is Not A Good Conductor Of Electricity, Some Tap Water Is. What Could Explain This?

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Katie Harry answered
Pure water is a very poor conductor of electricity because it does not have any charged particles that can carry the current through it.

Now, tap water may contain certain ions depending on the source from where this water is extracted. Ions like sodium, potassium, sulfates, carbonates and chlorides may find their way into the water by leaching into it or if water passes over rocks containing these ions (or rather minerals).

These ions carry a charge and thus, lend the capacity to water to conduct electricity. Therefore, some tap water may conduct electricity. How good a conductor the tap water makes depends on the ions (amount etc.) it contains which depends on the source from where the water has been extracted. It also depends on what level of treatment the water undergoes before distribution.

One thing that should be mentioned here is that tap water is not unsafe to drink if it has a high electrical conductivity (i.e. High but within WHO drinking water limits). Some springs are known for healing powers because of the minerals they contain. In other words, they would have high electrical conductivity but the ion in them may actually be therapeutic.

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