h2o freezing temperature

[1Coolfactor]

Does water that is distilled freeze at a different rate than tap water?

[PeteHull]

The freezing temperature of water depends on any impurities, distilled water would have little or no impurities so therefore would stay liquid for a lot longer then say tap water. It is the impurities ie limescale crystals, salt or dust etc that cause the water to freeze at 32deg F or 0Def C.

[gen2]

Let me elaborate on PeteHull's answer.

The freezing point of water remains the same, regardless of whether it is distilled or not.

However, if the liquid is undisturbed and has no nucleation centres, it can become super-cooled, remaining liquid way below its freezing point. Agitation will stimulate freezing, thus proving that its freezing point has remained unchanged,
As a double-check, warm it up and see what temperature it melts at - 0deg C. This again proves that its freezing/melting point is unaltered by the process of distillation.

This was a common observation back in the days when:-
a) We had regular cold winters.
b) We used to keep bottles of distilled water in the garage to top up the car battery.

[blackeyed]

i dont know about rate but,tap water wold freeze at a different temperature than dist. water because of its impurities.

[1Coolfactor]

Thank's you all seem to be up on this subject more than I and I.So what I'M getting is that water freezes faster when there are no impurities? Is that right?