pure water is said to b a poor conductor of electricity even though it dissociates into ions...y does it nt conduct electricity even wen ions r present?n wat changes r brought in presence of an impurity?
2006-12-18 05:03:14 · 10 answers · asked by Saniya 1 in Science & Mathematics ➔ Chemistry
water does NOT dissociate into ions, you need to add something that does (like a salt), to allow water to conduct electricity
2006-12-18 05:05:55 · answer #1 · answered by Nick F 6 · 0⤊ 1⤋
Not a detailed answer, I'm afraid, but the main reason that there is very little conductivity of electric current in distilled water is that there are insufficient salts and ions present to produce the necessary ion /electron exchange that acts as a carrier of the charge through the water! Phew. Got there in the end!
2016-05-23 04:37:34 · answer #2 · answered by Diane 4 · 0⤊ 0⤋
Pure water at 25 C has a pH of 7, which means the ionic content of the water is 0.0000001 molar Hydogen Ion and 0.0000001 molar Hydronium Ion. The conductivity is 0.56 microsiemens or the resitance is 18 megaohms... The only ions present to carry a charge is H and OH group. If you add salts to the water, Na+ CA++, K+, Mg++, Mn++, Cl-, CO3--, No3--, SO2-, SO3-- Then more ions are available to carry electrons.
2006-12-18 05:17:20 · answer #3 · answered by Mr Cellophane 6 · 1⤊ 0⤋
to be very simple, the pure water (chemically and electronically cleaned and purified only..not the natural or mountain water) does not have any metals or ions in it. where as the water which is found on earth contains minute amount of impurities and metail and ions contained in it. conduction of electricity needs free ions and hence that water conducts electricity.
Hope this clarifies your query.
2006-12-18 05:13:59 · answer #4 · answered by mmbaskr 3 · 0⤊ 0⤋
Only a very few ions exist in pure water:
H2O <----> H+ + OH-
This equilibrium lies very heavily to the left hand side.
Impurities, such as ionic solutes, will dramatically increase the number of ions per cubic centimetre, and so impure water will often conduct much better than pure water.
2006-12-18 05:07:32 · answer #5 · answered by Gervald F 7 · 0⤊ 0⤋
Water is a solvent. For Electrolysis to occur, a solute should be present in a solvent so that it can break into cations and anions.Only in the presence of other substances, does this occur and hence conduction of electricity occurs in its impure form.
2006-12-18 15:14:33 · answer #6 · answered by Kala K 2 · 0⤊ 0⤋
Out of 55*(10sup.8) molecules of H2O, only 1 molecule undergoes dissociation as H+ & OH-. So pure H2O is bad conductor of electricity.
2006-12-20 23:14:28 · answer #7 · answered by Mayur D 1 · 0⤊ 0⤋
water does not contain ions . hence pure water does not conduct elecrticity . impure water contains salts like MgCO3, NaCl etc .when they r dissolved into water they split into ions .ions are free moving charge carriers hence impure water conduct elecrticity
2006-12-18 17:33:53 · answer #8 · answered by kainesh p 2 · 0⤊ 0⤋
Pure Water is not ionised so it cant conduct electricity.....however most water we come by contain dissolved salts which ionise and therefore conduct electricity.
2006-12-18 17:53:30 · answer #9 · answered by adsc 3 · 0⤊ 0⤋
who said water has ions????????? check ur fundas.water is made up of oxygen bonded covalently to 2 hydrogen atoms.as water is a covalent compound,it doesnt conduct electricity
2006-12-20 04:29:55 · answer #10 · answered by praveen k 1 · 0⤊ 1⤋