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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: mana on April 29, 2023, 03:10:11 AM

Title: spilling out water while boiling
Post by: mana on April 29, 2023, 03:10:11 AM

Hi all
some students were trying to measure boiling point of water by heating a half full beaker containing distilled water on a heater, near the boiling point of water (above 90 ^oC) when their thermometer contacted with the bottom of the beaker, the boiled water spilled out suddenly, all the time that they did that the water spilled out. can anyone explain why this happen?

Title: Re: spilling out water while boiling
Post by: Hunter2 on April 29, 2023, 06:25:55 AM

At the bottom the temperature is more hot and the water is overheated. To ditch with something to the bottom it disturbs and the water directly vaporise and the steam pull out the liquid water.
Compare put some small boiling stones in the Beaker and it will not happen.

Title: Pieces of pumice stone are added to liquids to avoid spilling out while boiling
Post by: Vidya on May 12, 2023, 10:54:26 PM

Hunter is right. When we add pumice stone during boiling of liquids ,we create a passage for steam collected at the bottom(due to difference in temp) to move out and this helps in preventing liquid to *Ignore me, I am impatient* out.