Lab-Potassium nitrate(KNO3) in water

Essay by TheKamelRiderHigh School, 10th grade December 2007

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Chemistry Lab- KNO3 in waterTo start with, I want to say that this is not a normal lab report, but merely some raw data. Another thing is that the conclusion isn't very advanced and can be improved inn many ways.

We made a lab where we were supposed to find out at what temperature Potassium nitrate (KNO3) was solved in water. To do this, we needed a beaker, test-tube, weighing scale and something to check the water temperature with.

We started by putting in an amount of grams of Potassium nitrate (KNO3) in a test-tube. Thereafter we poured some a constant amount of water (H2O) in the test-tube, which in this case was 4 ml. We then put this test-tube in a beaker filled with boiling water (H2O) so that the Potassium nitrate (KNO3) was completely solved. We had a “temperature-checker” in the test-tube all the time.

It would have been very hard for us to find an accurate temperature value of we had been checking to see when the Potassium nitrate (KNO3) was solved, since the temperature increases very fast. This will not be a problem if we instead check the temperature when the Potassium nitrate (KNO3) is cooling down, (and the atoms of it becomes more stable so it becomes a solute) because that process will take place at a slower speed and you will therefore find a more accurate temperature. And that is what we did.

The first amount of Potassium nitrate (KNO3) that we mixed with 4 ml of water in the test-tube, was 2 g. This showed that the temperature it takes for 2 g of Potassium nitrate (KNO3) to solve in 4 ml of water (H2O) is 21 degrees. And we kept on like this and only changed the amount...